By joining you will help ensure that we can continue to provide this service
JOIN HERE!
1978 R80/7 engine removal
1978 R80/7 engine removal
Applied penetrating oil. Should I try heating up the frame on both sides and just hammer it (with nut on) from one side?
Sorry, can't seem to post pictures right now.
Ian
- schrader7032
- Posts: 9052
- Joined: Fri Oct 27, 2006 3:00 am
- Location: San Antonio, TX
- Has thanked: 3 times
- Been thanked: 36 times
Re: 1978 R80/7 engine removal
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.
- srankin
- Posts: 1081
- Joined: Fri Jul 14, 2017 8:45 pm
- Location: Spencerport, NY USA
- Been thanked: 21 times
Re: 1978 R80/7 engine removal
I had forgotten how heavy the engine is on an airhead until I removed mine a month ago. I did a strip job on it removing anything I could to lighten it so I could lift it out myself. My wife did the job of pulling the bolts out. Otherwise I would have used a jack or borrowed a scissor lift. St.
Re: 1978 R80/7 engine removal
Like ST said ... they are heavier than they look. I tried picking up my R75 engine and had to put it down.
Re: 1978 R80/7 engine removal
I do have a scissors jack under the engine, and can see the engine move up and down with the jack (got the rear bolt out this way), but I'll have another go at it this weekend.
Have it stripped down - gear box, valve covers, heads, cylinders all off, will be interesting to see how heavy it is...
Ian
Re: 1978 R80/7 engine removal
Re: 1978 R80/7 engine removal, timing chain replacement?
I've been reading opinions on replacing timing chains and bearings. Anyone want to weigh in? 52,000 miles on the bike, I was probably heavy on the downshifting (but that was 26 years ago....); and opinions on replacing the bearing while I'm at it? I feel like I have it apart now, might as well do it.
Oh, and the engine was heavy, but not bad stripped down. I have a wood assembly underneath because the oil strainer assembly protrudes below the crankcase.
- schrader7032
- Posts: 9052
- Joined: Fri Oct 27, 2006 3:00 am
- Location: San Antonio, TX
- Has thanked: 3 times
- Been thanked: 36 times
Re: 1978 R80/7 engine removal
https://bmwmotorcycletech.info/timingchain.htm
Pretty tough call on whether to replace or not. I don't think it's easy to say something is worn or not. Some of the wear is going to be on the sprockets with the sides of the teeth getting cupped or thinned. The crankshaft sprocket tends to wear more than the camshaft. As I recall special tools are needed to remove these sprockets...getting them back on requires heating the sprocket in a bath of oil so that it expands and will slip on more easily.
The original chain doesn't have a master link so likely a link will need to be cut to get it off...replacements will have a master link.
But at 50K miles the chain might be OK...extra engine braking might have accelerated wear. But still 50K is not much. If it were closer to 70-80K, it might be a no-brainer to do it. I have 110K on my /7 with original chain. I don't hear or feel anything, so I'll just keep motoring along. I'm fairly easy on my engine, though. I think you're in a position with a tough decision and will need a commitment. Do you want to be back in here after another 20-30K miles...maybe 50K miles? Or should you bite the bullet and get it done so it's bullet proof for the next 100K miles?
Be sure and block the crankshaft if you plan on proceeding with chain replacement!
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.
Re: 1978 R80/7 engine removal
- srankin
- Posts: 1081
- Joined: Fri Jul 14, 2017 8:45 pm
- Location: Spencerport, NY USA
- Been thanked: 21 times
Re: 1978 R80/7 engine removal
I would not bother to replace the chain with the miles you have on the bike. I have the single row chain on my R80RT and it lasted 80K before the first change and that was after 80K miles of treating the bike like a liter class super bike while riding. The double chain is more durable so 50K miles is not a lot of miles on it.
As for bearings, same goes, don't bother unless you have run the bike out of oil at one time (you haven't so don't worry) or you have 550K miles on it not 50K. I am at 140K miles on my RS and 240K miles on the RT and the cranks, and main bearings are fine. Also, the bearings are not something I would want to do myself as a learning experience. They are best left to a good airhead engine shop to do. I do mean a good airhead shop, car engine shops may not get the job done right. But, I don't think you need to worry.
I think you will find once you get the spindle for the timing mechanism cleaned up, get it working properly and seal up any oil leaks and such, once back together you will have a fine system and a lot of good rides.
Thanks for keeping us up to date on your progress, Cheers, St.