PCV Breather Mod on a GM 3.6L HFV6 ALLOYTEC - ADVENTRA COMMODORE CAMARO CADILLAC RODEO CAPTIVA
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- Опубликовано: 2 ноя 2022
- 40,000km update after this mod • THE CORRECT PCV mod 40... As a followup to my video earlier today about my Alloytec PCV cleaning Maintenance for HFV6 3.6L LY7 • Alloytec PCV Location ... and after a few comments I learned that there are specific hole sizes to the mod to increase the hole size on the PCV valve to allow the engine to breathe better this really applies to any GM 3.6L V6 also known as HFV6 (high feature v6) which is used in Australia in Commodore, Rodeo, Camaro, Cadillac, Equinox, Captiva and other models and ranges that used the GM 2.8L 3.0L 3.2L and 3.6L ALLOYTEC LF1 LFW LY7 LLT engines as far as I am aware LFX received the fix for this in the mid of 2013 (could be 2014 in some parts of the world) from the factory.
From some googling some reports that bottom holes are 1.5mm and 2mm with a 3mm top hole, while others say both bottoms are 2mm and the top is 3mm previously I used the 3.5mm top and 2mm bottom which resulted in quite an increase in oil return into the intake, so I decided to grab another PCV Valve I had laying around today and did 1.5mm, 2mm bottoms and 3mm top, reinstalled and see what the outcome might be like in a few month time as now I know I have a healthy engine in my Adventra.
I do not wish to install a catch can, so if this mod returns oil I will revert, but if it doesn't and the PCV Valve collects I might pull the PCV Valve again and try to go larger on the holes again by 0.5mm - also after checking my drill bits are the correct size as I have a feeling my 1.5mm isn't the right size (which I realised later when comparing my holes to other pictures around on the internet).
#alloytec #pcv #holden 
Развлечения
40,000km UPDATE to this mod ruclips.net/video/hGNXfc7U598/видео.html
That timelapse was a great idea. I soaked mine in kerosene and it went black. I hear that drilling pcv like this but also running the updated valve cover gaskets is beneficial. Love this channel
I drilled out mine completely and added a catch can. The difference has been amazing
Did think about doing this, but ultimately my intake is mostly always dry anyway. I don’t know how people end up with some much oil in theirs. I wonder if it’s because we hardly do high rpm work and mostly low rpm as we use them off road. We use full synthetic 5w30 same as you?
Great video. I've always been avoiding the mod for the exact reason explained in the video. I have purchased a second PCV valve and alternate between the two while one gets a good bath.
I’ll add these to the Just Commodores thread on modifying the PCV.
for anyone looking for this just commodores thread its here forums.justcommodores.com.au/threads/alloytec-pcv-problem-fix.279039/
This was a fun but satisfying mod, I'm also on the passenger side add a valve cover breather to allow ventilation to that side of the crank case
Really appreciate your video.
Im my application with mostly lpg , very good synthetic oil engine hygene and low revs -the functioning standard pcv is seems fine.
Still good to see the mod - if its needed.Thank you very much.
Good job mate 👍
I pulled my valve out one side was blocked so I cleaned it out now I’m thinking about drilling it out 3mm and 2 mm themes to be the way to go cheers
father and i did drill it out more but add fine mesh (and 3 coarse stainless steel scour pad) to the inside of tappet cover with 2mm stainless steel rivnuts and bolts, no oil in intake pipe so far and i do clean it when i do spark plugs
interesting idea, in th end as long as the engine can vent positive pressure with minimal oil return that's all that needs to happen.
Oven cleaner works great to clean out carbon and great cleaner for removing the gunk in the tappet covers, keep away from aluminium.
Fu Manchu guys, truly is a wealth of knowledge! Used his advice religiously when I had my Calais for several yrs. Pity the same couldn't be said about I Love Smoky Bacon or whatever the heck the arrogant self righteous prick went by.. Good vid mate and thanks for taking the time to upload 👍
Yes he? is very resourceful, 👍 I found out something new which I have video footage of but not yet done an upload.
If PCV is drilled beyond these specific sizes when you pull the oil cap off you get feedback from intake pressure and NO OIL is visible hitting top of the reflection plate at the fill hole on idle. Replace it with a correctly sized drilled or factory one and oil instantly returns visible hitting top of inside engine and flowing down over the plate visible at the fill point. I wonder if this means anything with further negative effects as a result of oversized hole or total removal of the PCV beyond the mentioned specifications by @Fu Manchu ❓
@@AllTerrainAction , do you know the correct part number for a new PCV for the VZ? Cheers mate, love the vid.
I comment too much but helps the algorithm
haha, we're not complaining! I realised today you wrote that PCV mod guide on Just Commodores, what you say makes plenty of sense though so hopefully with these fine increases it helps. I haven't yet looked at fuel trims properly waiting for motor to settle down, done around 300km's so far in it since the rebuild bit anxious to go too far away from home yet just incase but once we pass the 1,000km mark probably be a little more relaxed. Cheers for all your feedback mate!
Well. Could tell you but then; you know, I’d have to…
@@craiglawrance8188 It shows a video is being interacted with. Likes, subs, comments and sub comments (and their upvotes) are ranked by RUclips and each worth a certain importance to the RUclips algorithm. Videos with healthy interaction will be promoted on other peoples timelines who might not normally find this content. It might be a wild card on their timeline or that the video shows something they might be interested in based on the algorithm of their viewing history and channel subscriptions.
@@FuManchu5ltr someone knows their RUclips stuff! Great with PCV's and youtube growth!
blows my mind that such an important part and can have a devastating effect on the engine and its just shitty made little bolt... if this was a computer it would be covered in gold.
I reckon if you drill the pcv you should definetly invest in a catch can setup
Honestly the best thing for em
I want to do this on my 2012 Lacrosse but I wonder if they sell the new part with the holes enlarged already? They certainly should!
I heard the do, but it’s an easy mod to do with little risk if you drill the correct sizes!
I’ve installed a catch can on my ecotec
A friend of mine is a Mechanic in Barmah Victoria. He is a believer in the drilling out of the Alloytec PCV valve. But being an older guy he says to me the size in imperial measurements. I can never remember the imperial size. I think it had an 8 in it I'll have to ring him, then google what the Metric Equivalent is.
Hi Chris, hope you guys had a great Xmas.
Chris by chance do you have a part number for the PCV valve?
I have searched high and low in Repco and sparesbox websites, for the life of me I cannot find the part, any help and direction would be awesomely appreciated. Thanks kindly Chris.
I don’t I’m afraid and I think you can only buy them with the rocker cover (I could be wrong, but that’s what I read).
Thanks Kindly Chris, much appreciated, it seems to be a rather elusive little part, I'll keep searching on the web. Best wishes for 2023 mate. Cheers.
@@winterrosebeaumont6209
EBay. Alloytec pcv. $40
@winter rose.. how did the research go for you?
I'd drill it out with the largest bit I could use without destroying the fitting and attach a host to it and run almost all the way to the ground :) both sides. Then plug the vacuum line.
Hey mate what did you use to pull out the pcv valve? Mine was so hard to pull out.. 😢
The first pull will always be really difficult. Just multi-grips on the end. Make sure to remove the plastic clip on first then grip the metal and yank upward.
I've always added a baffled catch can setup and not used the pcv valve in most my car's.
If you end up getting excessive blow by you could always add one in before it returns back into the air intake. I'll add but I'm not 100% sure how it all works on the alloytec.
PCV is just PCV so same same, ours is not a one way valve but it seems if the passthrough is too large you'll get excessive oil return, I think if it was a through system and you had a catch can its fine but from what I now understand these micro adjustments to hole sizes (2mm bottom, 3mm top) lets the factory ventilation system breathe so much better that the engine behaves better. I found when I pulled driver side cam covers off, the way the case is setup if you abused your alloytec and did not service well and also neglected PCV maintenance there is a chamber at the rear side of the motor that will get clogged up underneath the cam cover, and even though the PCV valve might get cleared the passage under the cam cover is still, clogged and has build up of burnt oil and deposits. Diesel grade engine oil helps break it down over time, but I would think a heavily neglected alloytec would need cam covers off and a manual tidy up followed by Diesel grade oil for awhile if not indefinitely after. People say Diesel grade oil lacks the zinc needed for the alloytec, but we and many hundreds of other v6 Adventra's owners have not seen a side effect for almost half a decade and some of those engines are on original timing chains and getting up near 400,000km range with the last 200,000km's of that been following this diesel oil use. 5W-30 Full Syn at 7,000 - 10,000 km intervals. First oil change with diesel, beware of build up of sludge and change oil and filter early if your oil filter shows signs of collection of high amounts of sludge in the first 500-1,000km's after your first diesel oil use.
What is diesel oil? @@AllTerrainAction
So we are talking using a 5W30 or 5W40 Full Synthetic Petrol (and also labeled suitable for Diesel engines) recently Nulon made a change and the go to is Nulon APEX+ 5W-40 Full Synthetic it as of this year now shows a GM dexos2 approved badge on it. Approx 7ltrs + $100 from supercheap auto.
@@AllTerrainAction
Can you please confirm you are using the Nulon 5W40 Apex + 7ltr
Labeled DIESEL?
@JohnW-dh8pl yes I am it should be the one that shows DEXOS2 logo on the front. Anything dexos1/2 is fine for the alloytec in diesel spec.
I use a engine oil cleaner every second oil change and change oil every 5 thousand kilometres I’m sitting on 160000 klms at moment doesn’t use oil or dirty the oil
I have just pulled a motor out of an 06 Crewman with 155km genuine,for a bloke that was quoted 7+K to replace motor ,he said it rattled and then stopped, would not start,feels like the plugs are out! But i got a good 2ndhand motor for him,do these have to have 5/30 full synthetic oil? Thanks Aussie from the shakey isles..
Yes 5w30 full synthetic is the way, to slowly clean up built up sludge over oil changes use diesel spec oil that is dexos1 or dexos2 approved and it’s safe for your alloytec 3.6 - check filter every 1000km to ensure clean up process isn’t building too much sludge on the filter and change as nessasary. First oil change after 5k then 7-10k changes there after. If engine was very sludgy you may need to change the filter once at 500km and again at 1000km for the very first due of diesel spec oil.
@@AllTerrainAction Ok,thanks for that.I definitely going to that pcv mod for sure!
The biggest hole was 3mm and the two small ones were 1.5mm and the other one 2mm? Thank you very much.
Thanks!
but NEwA, on that note, wN I did that I had a hyper aquantances which I made the mistake of rushing for, & so pushed on drill to get holes completed quiker- &&& drill bits went way to far in - & I noticed you did that anyway. do you have any guess or knowledge on wats in these new style(not) pcv valves & wat may or may not B damaged from that?✋🤔
They are, empty - nothing inside them if thats what you are asking. They are not one way valves like some older styles. You can see right through them clear when cleaned.
@@AllTerrainAction
I DID notice that C str8 thrU 2 other hole pRt, wat mAx U so sure there’s nothing along all the sIds?✋🤔
Diesel oil is full of detergent so you are basically cleaning the inside of the engine can have draw backs on worn engines
yeah if engine is very.. sludged 100% do not use any engine clean additives, I think diesel oil is a bit more sensible as its a longer process time to break down. If you know your engine is bad, I tell people change to diesel spec oil, same viscosity but check your OIL FILTER at 500km, 1,000km and 2,000km at any point if it looks like its full of sludge or contamination, change oil again early/stright away and monitor again until your seeing a clean filter again just because this is the most saftest way to clean up an engine over time.
Hay mate hows it going, i just drilled a massive hole top and bottom going fine so far haha
It'll breath alot better that way but you have gotta be smashing oil use? Pull off you intake and see how much oil is in there. Nothing overly wrong with this really if it works, it works. Cant argue that!
@@AllTerrainAction yeah good point I'll have a gezz tomorrow see what it looks like. Cheers dude
Does anyone know what the later size holes are on the pcv plus they don’t seem to list a pcv in parts anywhere
later size as in the holes size they used on the LFX when it was a global change or? @fu manchu question really.
They modified the valve I think from 2012 I’m just wondering what they made the hole sizes
Doing stuff so technical you need to throw it in a milling machine or at least a drill press. Not not everyone but I sure would have too.
Hi, can any one tell me where to find the EGR valve on a VE 2011 HOLDEN COMMODORE 3Litre. I have looked every where for something that looks like it could be the valve but no luck. (by the way great video)
Seen this but I am unsure myself, sorry.
Thanks for your reply, but this video is about the PCV valve which is to do with fuel vapour , the EGR valve is to do with recirculation of exhaust gases. Cheers, thanks any way. @@AllTerrainAction
@@bathtime21 I could be wrong but I undertstand the PCV is recirculating postitive pressure in the crankcase to recirculate back to intake system for it to be reburned again in the cycle. Fuel vapour is new to me, where is this information referanced as I'm interested to check if there is a fact missing in our video. The LY7/LEO to the best of my knowledge at least on the VZ Commodore never had EGR valve. Cant be sure about the later alloytec range.
Yes you are correct about the PCV valve. I was getting mixed up with the EVAP valve which is to do with the fuel vapour from the fuel tank. It would also appear that the VE Commodore does not have a EGR valve as you mentioned. The only reason I went looking for the EGR valve on my car was because my scanner showed a fault code indicating the EGR. So I’m not too sure what my next move on this problem will be. Thanks once again for getting back to me.
@@AllTerrainAction
Something we have noticed @@bathtime21 which isnt relevent to your case relating to fuel vapor if you get negative pressure in your fuel system (unscrew fuel cap and get air suction sound/release) your charcoal canister might be packed up. This can also lead to engine crank but no turn over problem occuring often on a warm day, or randomly when you have still fuel in the tank but engine will cut out or run poorly at idle. We are seeing more VZ's with this issue at this age and is becoming quite common.
My PCV valve broke and can’t find one, does anyone know where I could get one??*mine only has 1 hole not 2*
Best going to find a wreak and pulling one these days mate.
Hey why did you drill 2 different size holes and does it matter which you drill smaller and which gets the bigger drill bit? Just wondering everyone else recommends using the same size holes on the bottom of the PCV's!
Sorry mate missed this comment, we drilled 2 sizes as that’s what the actual recommended specs are and are those matching future GM fix of the later generation alloytec.
@AllTerrainAction weird when i went to drill mine one was already the size i was told to bore the bottom 2 holes. I remember you had them at 2 different sizes i thought it was too confusing not knowing which hole to make bigger and which should be smaller... thanks appreciate any help i can get 🙏
Also did you ever find out if those drill bit sizes were good? Or...? Thanks!
@@nkastis8211 yes those sizes are fine, if you are off by a little it won’t upset anything just be sure to clean it well before reinstall.
Im having trouble unscrewing my pcv valve out, any tips?
Hey mate, there is a clip on the plastic part that you have to slide and pull up once the plastic hosting is off its a matter of yanking on it with multigrips upwards. First removal is hards subsequent removals are easy as.
@@AllTerrainAction thanks heaps man, life saver, well, engine saver😅
Easier to put a new valve in ? $50 ?
I suppose but this doesn’t take too long once done and regular maintenance is easy.
Hey sorry new to cars what is the point of this? I have an alloytec
Engine needs to release positive pressure out of the engine, if this gets blocked pressure builds up inside and instead will cause seals or blow head gaskets (less likely) and cause issues you can otherwise avoid by keeping this clean and flowing.
@@AllTerrainAction thanks man I’ll do this tomorrow haha
@@jordynjackson1664 if you watch the first 4 minutes of this video I explain what I just said in text but video on an engine, for a better understanding - ruclips.net/video/yJkm2HvebSM/видео.html
These valves help your engine breath. if they block up or dont function as they should you willend up with stretched timing chains resulting in a chain replacement job that here in NZ will cost up to 3000$$ . I did my own .... What a mission. Regular oil changes are a must do. Hope this helps.
@@AllTerrainAction Blow head gaskets, what?
Can you make an update video soon?
I assume in terms to see how it's going, I will check it out this weekend and also check intake to see for any oil and update!
@@AllTerrainAction yes! Thank you!
@@AllTerrainActionhows it looking?
@@hirokawiti4932 yeah really good, dry as in the intake. I checked the valve also at 28,000km on and clean! Just a bit of carby cleaner to clean residue out and reinstalled. Engine idles smoother, can’t say for running I feel like it’s running better but hard to know, definitely not worse!
Finally hit 40,000km and did the video! ruclips.net/video/hGNXfc7U598/видео.html
I heard those aren’t actually pcv valves anymore, technically, although still calld that.
Still a positive crankcase ventaltion valve.. so I think they still do the same job. I've heard of people blocking these.. and thats just crazy I wouldn't do that.
@@AllTerrainAction
it’s Ok, nO nEd thA sLf blok( w/cRbNE sut-a-ma-guk)👋
I would really like someone to cut one of these open with a dremel or something. Everyone considers the Alloytec PCV to be straight though, but I reckon there might be a spring and a disc in there. Anyone wanna sacrifice a PCV for science?
I can definitely see through it, it’s hollow unless the spring is out of vision. Happy to angle grind the top off one and show you… for science right 😂
A bit of pressure on me now.
😂
It is 2mm bottom, 3mm top correct?
@@cumminsfj4586 I’m reading that most people do 2mm each on the bottom and 3mm top, but I did one 1.5mm and the other bottom one 2mm as Fu’s guide said they don’t say why it’s different sizes on the bottom but he also did double 2mm and had no issues, I might change mine to that in the future just seeing how this goes first.
@@cumminsfj4586 the two bottom holes are drilled at 2mm (or 2mm on one and 1.5mm on the other). Top hole drilled to 3mm.
Clean the intake plenum, PCV lines cleared out, MAF sensor and intake pipe cleaned out.
@@FuManchu5ltr Will be doing mine tomorrow! Seen you on the justcommodores forum
That PCV valve is not a 'valve', more accurately it should be called a breather or even a PC breather regulator. If you open it up there is no 'valve'.
Yeah this is correct, we probably could have said this - originally PCV systems where one way with a valve on these particular engines it’s as you say really a breather with limited flow based on hole size. Drilling this too excessively will permit negative pressure in the crankcase and blocked will prevent normal operation of the engine, linked to timing chain failure relating to lower oil pressure. Left bank has a straight through breather, while right bank has this breather/valve.
None of this works! Why 🤔? Because if you look at the underside of the valve covers the hole where the PCB valve access into the cylinder head crank case is heavily gunked up with oil! Fact!
The holes your drilling are insignificant and do little to nothing to relieve crankcase pressure!
It would be better to simply drill the holes as large as possible to help relieve crankcase pressure!
Not when we opened ours... was nice and golden yellow/brown this is primarily an issue for early life abused alloytecs but it's better to do this than not, drilling huge holes for no reason is actually more of a waste of time than anything unless you have a catch can. You'll just burn off oil and be topping up your oil.