Can A Rollover Trigger Low Oil Pressure In A Jeep 4.0? Let's Investigate!
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- Опубликовано: 15 июн 2024
- Just on a hunt for a good used engine, I run into the story that this was a rollover/wrecked Jeep Grand Cherokee. Jeep looked a little rougher than the average wreck, but who knows. Before I pulled the engine the oil pressure dropped down to nearly 5psi. Without just doing a full rebuild I go through steps seeing what helps get the pressure back up. Just a video for learning on mine and your end, hope you enjoy!!
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You can tell Dex buys his own brake cleaner 🤣🤣. He uses it sparingly compared to when the shop pays for it haha.
Appreciate your efforts. I've learned A LOT off your channel. To the point that when I walk out to work on my Jeep, your elevator music subconsciously starts playing in my head!! :D
ha ha me too -
Sunday night, dex on chasing another 4.0 down the rabbit hole😂. Man I appreciate the consistency, ending the week perfectly
I've never seen a mechanic with such dedication and heart and soul good job ❤️
Thanks for making these "research" videos
I truly enjoy your trials and errors to teach us what to look for when we are working on our own 4.0
Almost 98k of us enjoy ... Great stuff as usual.
Dex said it crunk up good haha this channel is quality entertainment. Almost 100k subs!
Really enjoy these videos dex, dont ever stop. Love it !
Oil pump pickup tube. My rock crawler even with a skid plate over the sump had a big rock push in sump part of the pan. didn't realize how bad it was because the skid plate flexed back but the pan underneath was dented at least an inch. pulled the pan, the pickup tube where it's press fit into pump was loose. (Sucking air randomly while on the trail gave erratic oil pressure)
Yeah your motor was hemorrhaging. AKA bypassing back into the pan b4 it goes thru the whole motor.
More like, sucking air. Just like drinking out of cracked straw.
The red (0.002 - 0.006) and blue (0.004 - 0.009) plastigage measure larger clearances.
Damn great video! Years ago I dropped my XJ off at a "buddies" shop to install a rear main seal. I was going TDY so I wasnt able to do it myself, I dropped it off with all the parts. About a month later while I was still gone I gave him a call to check on it, he then talked me into replacing the oil pump. "Since it the pan was already off" a original engine with 100k that got great oil pressure. I got back picked it up, drove it home next day started it up got about 5 miles lost all oil pressure on hwy. The replacement short block was like that one.... low oil pressure. Now the engine did hold together and ran until the transmission gave up over 5 years later.
Unfortunately he had a s### head working for him, doing shoddy job. He was a good guy but was having some hard times and was dependent on his employees at the time. His mechanics did hurt his reputation and business before he passed.
im here for the elevator music, but mine does the same 40 at idle drops to 13-15 on the gauge, just refreshed with pistons.
I had a brand new Autozone (last resort) oil pump have good oil pressure but killed my brand new cam's distributor gear within 50 miles of a rebuild because the pump's gears were running against the plate on the pump. The new Melling is great - no less than 50 psi all the time.
Mine had a similar problem I put a new oil pump in and it has 34 pounds. Best it’s had since we bought it new
I love your stuff bro keep doing what you’re doing, don’t listen to other people. You are doing what you love
The knowledge is strong with this one keep it up 👍.
Look forward to all your videos!
I ran into the same low oil pressure symptoms shown here. I had a piston skirt break and did new pistons and new rod bearings. Checked all clearances and rod bearings were at .002” mains were at .002”-.003”. My old oil pressure sender was faulty so I replaced it while doing all this. After I got it back together at cold start it had 50 psi of oil pressure, once warmed up it dropped to 10 psi at idle and would build 30 psi driving around. Tore it apart again and found the cam bearings were all worn. Must have had lower oil pressure the whole time but realize it due to the old faulty sending unit.
Thank you for your time and patience. Im learning from you, I love my jeep.
Really great videos. Thank you. Really down-to-earth testing and reality.
❤
I appreciate everything you do in your videos! Great video and very informative! I’m waiting on the turbo build. I like to give my tj a little more power.
I appreciate you letting us follow you along. Sometimes when you read the caliper dial I cringe a little, but I know what you mean ! Cam bearing clearance is tough to read but I think your brother has the indicator that can do it. Honestly cam bearings are cheap and not that hard to replace, so I will probably start doing them automatically if have doubts. So when are you going to tackle a 4.7 ?
honestly I would want a head gasket that sticks so good to the metal that it takes a milling machine to remove it. its just good practice to deck the head and block if rebuilding so it would not really be an issue if your taking the head off something really wrong has probably happened
🤔 Interesting video... I enjoy these dive into projects for purpose of learning something new 👍👍
Think I've seen all your vids some several times. You should build yourself a good test stand! One that can do any Jeep engine, just bolt on, click in and go. You do just fine and the one you have is fine but better is better. Do a vid on the build, you will love it and pick up at least a few views.
I enjoy all your videos. My 1998 xj 4.0 has this issue low oil pressure after normal temperature. It sits at 10 to 20 at idle. Cold temp is 50… At 60 mph.. The motor has 362,235… Plenty of power.. I do run 10/40 oil in it to try to help with the bearings..
love this content bro!
You are a bad ass. Great vid and videos. This channel is prepped to go to the moon.
Dex, Thank you for another great and informative video for all of us XJ owners and lovers! I can't get enough of your videos! So Thank you so much for making them and sharing them as well.
Can you give me advice on getting a better alternator for my 97? I've got the 12,000lb Badlands Apex winch and I'm pretty sure I messed up my factory alternator while using the winch a few times during a decent pull for my friend.
The voltage gauge dropped down to 9 (while my Jeep was running) and now the gauge is reading 13ish volts while driving and drops to slightly over 12 at idle. 🤦♂️
Also, I got my bag of random fuses and relays in the mail today!! Thank you Momma Browder for being a huge part of collecting them for Dex to sale to us Jeep guys and gals. ❤☝💪
Thank you for all the info
Ty for the video brother 🍻
Thank you dex!
Well done mate 👍🏻👍🏻👍🏻💪💪💪
I just wanted to let you know i got my jeep fixed we have talked about it the comments of other videos
It was a electrical problem with the circuit to the coil I ended up taking it to the neveda equivalent of dex jeeps he had it narrowed to a coil or the circuits that fire the coil in 15 mins and found the melted wires in about another hour it's running good enuff now
Good job 👍
wonderful video very good content should help many people
Thank you!
Well if not done right it could break a few things through hydro lock. Starting the motor with too much oil in the cylinders,
SNAP CRACKEL POP. 🤔👌
my 4.0 had a head gasket leak where coolant was getting pushed into the oil it was doing the low oil pressure thing till I noticed the build up in the oil fill cap it formed like a wax I think my oil pressure problem was from the oil getting thinned or something but a rebuild got it right back to 40psi
Dex,put some diferent weight oil,lets say 25w50, just to see how much oil pressure improves!
Thanks for the info! I do have a question for you!
How do you keep track of these motors and parts especially ones that have work done to them? Do you make a tag or work order for that motor so when you find it in 3 years you will remember what has been done? You have so many things at different stages I'm just curious!
Thanks Dex!
Thanks
Have ya tried running the 5 minute cleaners in the oil to see it improve ?
Keep it up 👍🏻 DEX the XJ / TJ Info man . 👍🏻🇦🇺.
Don’t know if this will help you had a 99 model XJ same issue took out the sending unit sprayed out the hole with brake cleaner, cranked it up with a rag wrapped around it shut it down sprayed it out again, wrapped a rag around it started it up sprayed it out again crank it up shut it down put the sending unit in it. It held 15 pounds it at idle
Thanks i have a 4.0 that i overheated... and one of the push rods was spitting oil 2 feet high.. i hope i can figure this out
My 95 xj with 233 thousand when it frist fires up it’s around 60 warms up gose to 40 and will increase when you rev it .
I watched a guy use a .010 over and a standard main bearing together on a 350, don’t know if that would work long term.
Love the elevator music 😂
My Jeep tj ideals at 20 most of the time but when driving it’s 50 I have the 2.5 litler
If this helps it has helped me..
Y don’t u change the oil bypass spring inside the oil pump, that little spring is what controls the pressure in the pump. Stronger spring = higher pressure, old worn out spring = low pressure…worn out spring lets the oil bypass before building pressure. This is not just a 4.0 thing it’s common in a lot of motors excpecially old small block chevies…
What oil should I run
in my 4.0 yj should I use 10-40 or 15-40
I thought project farm doesn't accept sponsors or anything like that?
You said something about him around 43:40-44:20 mark.
*edit to get time closer & to correct himself that he wants to be like him*
(If I recall, only way people can donate is in the chat, but i could be totally wrong)
How can I get hold of you to buy a rebuilt motor
I saw that you used 10w40 oil?
I'm not sure which oil to put in my zj 4.0, 10w30 or 10w40, I don't know if you've already made a video explaining the type of oil you use in 4.0 engines.
I don't know English and I have to use a translator, thank you if you help me
15 40 Rotella. Trust me.
does this jeep have an inertia switch and if so was it triggered
Do these older jeeps have rollover switches that kill the engine? I've never heard of one in an xj but the zj might? It would kill the engine in the event of a rollover
They do not. Just keeps running!!
Curious what's your favorite motor outside of the jeep family???? Just wondering....👍👍👍
I'd definitely watch a video of him and his brother rating other engines. Windsor, sbc, BBC, LS... just different engines that are popular in trail rigs, rough trucks whatever grassroots motorsports. I haven't watched Nascar in decades but I can't wait for the county fairs to start running events.
My favorite engines are the 3.8 Buick and SBC. 302 and 351W Ford's are really good too, the 302 really surprised me how it ran.
@@thisisyourcaptainspeaking2259I know that 3.8 is a great engine
@@thisisyourcaptainspeaking2259I don't know a lot about the 3.8 tho just heard that it's really good. I almost bought a 05 Buick with 3.8 kinda wish I would have
@@bobbystalder3323 The last of the 3.8's were the best but the even fire 231 (3.8) Buick Grand National was a solid engine. The 4.3 Chevy is pretty strong too, if you have no space for the SBC. I love fuel injection but it can be a headache transplant so I tend to stick with carbed motors.
What about running 15w40 diesel oil in my 98 4.0?
That's one thing he doesn't do for whatever reason. I've seafoamed then Rotella 15 40 3 4.0 engines with lifter rattle are it works.. really
4.0l don't need oil. Mine ran on hopes and dreams for years. Dex how come you don't do wranglers? You could double your business if you did. Anytime I post wrangler parts for sale they go quick
He had said before that there’s not much if any money it because cost for to buy and nobody wants to give up their rusted out beat to piss wrangler for the same price as a equal condition grand or regular cherokee
@@caseyb65well yea if you buy a perfectly good driving wrangler I could see that being the case. But I'm sure if he picked up em up as scrap/ wrecks and parted them out he would do just as well if not better than the cherokees. I know in my area wranglers are way more popular than Cherokees. Hardly ever see a Cherokee around here. Wrangler parts sell like hot cakes in my neck of the woods. Matter of fact theres a guy up here who has a good sized jeep parts business similar to what dex is doing except with wranglers also
98k subs... How many more videos to 100k, my $$ is on two more videos from here: what is the 100k video, do we meet your significant other in a bbq and beer vid, do an rc car dive, road trip.... yes, that is my ask. Road trip to your choice, VGG, MattsORR, Fabrats, or any other U-tube co-lab visit.
Dex what hone grid are you using for a quick rehone?
Gosh I’m not even sure. It’s the dingle ball style.
@@dexjs because I need to cange out my pistons as I blew one up last year.
And I checked that you can get them in different grids. 🤨
Wear nitrile gloves.....
Jesus Lord stop this silly bullship about it running when it overturned ? ? 20 things happen when a 4.0 is wrecked like that to stop them from running - first time you messed up Dex.
So…elaborate.
Dex has never said bad oil pressure will prevent a 4.0 from running.
What are you even saying dude? 😂
If a car falls over in a ditch - how the F does it keep running ? Gas - Electrical - Oil - all upset and the motor keeps running ? You think it’s the Dukes of Hazard ?
We've all seen there offroad videos they put em on there sides and roll em all the time and keep running them so we know these jeep motors can take a beating but not all of them are flipped or on there side for a short time while running