Heeft even geduurd, maar in een andere clip die ik gisteren geplaatst heb, kun je de nokkenas beter zien (clip = BMW rebuilding R67 2 engine). Nokkenas is trouwens nieuw. De nokkenas zat net ingebouwd in een R60 carter, toen ik een R67/2 carter op de kop heb kunnen tikken, wat natuurlijk de voorkeur heeft in een R67/2 motorfiets
Having the tools is one thing, but your tecknical skill is 90% more than mine...Hmmmmm...I have a R1100RS in pieces, the gearbox needs sorting out, so I will keep looking at your videos, and try and learn something
the +6 on the camshaft gear means that the center-to-center distance of the camshaft & crankshaft is 0,06 mm larger than the nominal distance. BMW measured every engine block after it came out of production. Not every engine block had exactly the same distance between camshaft and crankshaft. If the distance was bigger then nominal, they fitted a gear set with a + value (+1 to +10) If the distance was smaller then nominal, they fitted a gear set with a - value (-1 to -10) This + or - number was stamped in the engine block You cannot fit a gear set with a + value on an engine with a - value: the gears will not fit, because the teeth are too thick You should not fit a gear set with a value lower than the value stamped in the engine block: the gear teeth are too narrow so this would cause unwanted noise when the engine is running. The safest thing to do, is to fit a set of gears that have the same value as the one stamped in the engine block. However: if an engine has been running for 40 or 50 years, the aluminum housing has "grown" a little bit. This is the result of frequent expansion and shrinking (heating and cooling down of the engine) As a result, there is a chance that you can fit a slightly larger set of gears. For example, if +6 is stamped in the engine block, maybe you can fit a +7 or +8 set of gears The problem is that you cannot measure this yourself, unless you have a range of gear sets available (trial and error method) Camshaft and crankshaft gear must always be replaced as a set.
I wonder how much noisier these cam gears are compared to the later cam chain arrangement?
Heeft even geduurd, maar in een andere clip die ik gisteren geplaatst heb, kun je de nokkenas beter zien (clip = BMW rebuilding R67 2 engine). Nokkenas is trouwens nieuw.
De nokkenas zat net ingebouwd in een R60 carter, toen ik een R67/2 carter op de kop heb kunnen tikken, wat natuurlijk de voorkeur heeft in een R67/2 motorfiets
That's a nice Extractor you are using......may be a BMW Special tool......??
Indeed this is a special BMW tool (Matra 355a set). We reproduce them. bmwclassicmotorcycles.com/index.php/tools-products/puller-matra-355.html
Having the tools is one thing, but your tecknical skill is 90% more than mine...Hmmmmm...I have a R1100RS in pieces, the gearbox needs sorting out, so I will keep looking at your videos, and try and learn something
Looks like you have the same problems as I do trying to remove these old screws and bolts.....
I'm trying to figure out what +6 or I've also seen -0 on the camshaft gear - do you know what that means? Great job BTW..
the +6 on the camshaft gear means that the center-to-center distance of the camshaft & crankshaft is 0,06 mm larger than the nominal distance.
BMW measured every engine block after it came out of production.
Not every engine block had exactly the same distance between camshaft and crankshaft.
If the distance was bigger then nominal, they fitted a gear set with a + value (+1 to +10)
If the distance was smaller then nominal, they fitted a gear set with a - value (-1 to -10)
This + or - number was stamped in the engine block
You cannot fit a gear set with a + value on an engine with a - value: the gears will not fit, because the teeth are too thick
You should not fit a gear set with a value lower than the value stamped in the engine block: the gear teeth are too narrow so this would cause
unwanted noise when the engine is running.
The safest thing to do, is to fit a set of gears that have the same value as the one stamped in the engine block.
However: if an engine has been running for 40 or 50 years, the aluminum housing has "grown" a little bit.
This is the result of frequent expansion and shrinking (heating and cooling down of the engine)
As a result, there is a chance that you can fit a slightly larger set of gears.
For example, if +6 is stamped in the engine block, maybe you can fit a +7 or +8 set of gears
The problem is that you cannot measure this yourself, unless you have a range of gear sets available (trial and error method)
Camshaft and crankshaft gear must always be replaced as a set.