Forum bmwbike.com

Hello,

I restore my R60/2 engine and I am now stuck. The conrods are not centered in bores. I put thiner spacer on rear and thicker one in the front. Front slinger is almost in touch with the front bearing holder. The clearance between rear slinger and case is 2.40mm.
Do you know the thickness of the spacers?
The crankshaft was rebuilt here in Christchurch(New Zealand). Anybody knows the correct distance between webs? ( Or any mesurements wich can help me?)
Best regards, Razvan

"... The conrods are not centered in bores. I put thiner spacer on rear and thicker one in the front. Front slinger is almost in touch with the front bearing holder."

I have not removed/installed a crankshaft. And I don't where the spacers go. But I have heard that there is a final step in the installation that involves pulling the crankshaft foward in the case while everything is still hot. Maybe this information helps.

Hi Allan,

Thank you for your answer. I have pulled the crankshaft exactly like you said until it stops.
I don't like this position because of the gap between rear slinger and case which is way bigger then the front one.
I suspect the front spacer is not original.
Picture shows front slinger(left side view).
Best regards, razvan

Hi.
I just put my crank back in the case a couple weeks ago and don't have it to measure. But it sounds like the rear bearing may have slipped on the crank when you pulled the crank forward to seat the front brg. It is comon to not have too loose of a fit on the rear main journal. When the cool brg touches the hot case the case cools and grabs the brg and if the brg is not tight enough on the crank will stay there while you get the crank in the perfect position. I finally used Loctite Bearing Retainer to keep mine in place. The correct thing to do is build up the journal with hard chrome and turn to correct size.
It is hard too put the crank together too small. The rods limit how much the webs can be pressed together. You should try to contact Ed Korn at Cycle Works in the US. He knows more about crank problems than all of us combined .
Good luck
Garnet

Usually what wears the journal (bearing seat) is frequent removal and replacement of the intererence-fit bearing. Metal is lost from the journal with each pressing. I bought a bike with a rear journal that had been knurled and then coated with Loctite, and so I sent the crankshaft to Ed Korn to chrome the journal.
If Razvan's problem is a worn journal, he is fortunate to find this out now before the engine is reassembled.

Hi Garnet,

Yes, can be a problem but I am lucky and my journals are OK. The crankshaft will go forward until front bearing will touch the front spacer. If the spacer is not original ( maybe like my one) the crankshaft will go too much forward. My question is: conrods should be centered in bores or not?
I still belive my front spacer is not original and is too thin.
Best regards, Razvan

Hi Razvan.
I just looked at my case (i still have the barrels off) and the rods look to be in the center. I can't get my mic. in to get an acurate measurement. If your front spacer is too thin the slingel will come in contact with the front brg. carrier or case. Hopefully someone who has a crank in their hand can give you some measurements.
Good luck
Garnet.

Hi Garnet,

Please look at my pics and compare slingers positions with your slingers. Looks pretty the same or not? In your engine, the gap between rear slinger and case is bigger than the front gap?
Thank You Garnet,
Razvan

Hi RAZVAN
There is definatly more gap between my rear slinger and the case than the front one and the carrier. The front looks under 1mm and the rear mabe twice that. Tommorow I wil try to get a feeler gauge in there. To know for sure try measuring back form the seat in the timming cover where the small ball brg. goes. The inner race butts against the shoulder on the crank and the outer is a near perfect fit on the t/cover. You could try assembling just the small brg. and cover before the t/gear and cam just to check the position of the crank. The small brg. should be snug while the crank turns freely, if crank too far forward it will bind or the t/cover will not bolt down tight, if too far back you may see space between outer race and t/cover. It is easy to pull cover and brg. off to install
crankgear after.
Take care.
garnet

Hi Garnet,

I just measure the distance between crank's shoulder and cover's seat( cover on case without small bearing). Distance is 13mm. The bearing has 12mm. I am so confuse now. Maybe my crankshaft is OK? Maybe the slingers doesn't need to have same gap.
I still have the other problem with the conrods.
Are not centered in bores. This is normal for V8 engines. Maybe the same for bmw?
Best regards, Razvan