Splitting cases for transmission inspection

[maleko89]

Clymer says to remove the cylinder head first. Then, when splitting the cases, lift the top case from bottom; leaving transmission shafts, middle gear, balancer shaft, and crankshaft on the bottom half. Can I just remove the bottom case from the top if I only care about the transmission shafts?

This will be my first time removing and splitting the engine. I've managed to avoid having to do this for 25+ years of Vmax ownership.

Thanks.

Mark

 

[CaptainKyle]

Yes you can just remove the bottom no need at all to pull the heads

 

[maleko89]

Thank yah sir!

 

[gentsvmax]

Clymer says to remove the cylinder head first. Then, when splitting the cases, lift the top case from bottom; leaving transmission shafts, middle gear, balancer shaft, and crankshaft on the bottom half. Can I just remove the bottom case from the top if I only care about the transmission shafts?

This will be my first time removing and splitting the engine. I've managed to avoid having to do this for 25+ years of Vmax ownership.

Thanks.

Mark

+1 , hunt down some Yamabond for the re-seal, you'll appreciate it.

 

[maleko89]

+1 , hunt down some Yamabond for the re-seal, you'll appreciate it.

I have it on my list. What’s the standard? Yamabond #4 or #5?

 

[one2dmax]

Get a large baking pan, put a sacrifical rag in the bottom and flip it over. A lot easier to work on it that way. Lower the bottom on to the top.

 

[maleko89]

Get a large baking pan, put a sacrifical rag in the bottom and flip it over. A lot easier to work on it that way. Lower the bottom on to the top.

Like your flywheel removal video?

 

[maleko89]

Cases are split. When rejoining, I'm assuming I need to lift the top onto the bottom case? Doesn't look like the tranny shafts would remain in place in the lower half if flipping over but wanted to ask first.

 

[DreamV4]

Any pictures to claim "Vmax transmission mechanic" title? Pictures or it never happened!!!

 

[RempageR1]

Just set it up like this:



Then lower the bottom half on top of it making sure the shifting forks locate correctly. Once tightened, check all gears work and there is no binding.

 

[maleko89]

Any pictures to claim "Vmax transmission mechanic" title? Pictures or it never happened!!!

Not really! I haven't disassembled yet but gear teeth look great. The leading edges of the dogs on the 4th countershaft gear look a bit worn. I'll probably be replacing that along with its mating gear and will most likely do the shift forks. Bearings all seem good so far. Need to measure countershaft to see if it's shimmed correctly. Debating Royal Star 5th gear too.

 

[maleko89]

Just set it up like this:

View attachment 81757

Then lower the bottom half on top of it making sure the shifting forks locate correctly. Once tightened, check all gears work and there is no binding.

Thanks, will give that a go. Was worried the forks would stay mated to the shift drum grooves correctly doing it this way.

 

[Fire-medic]

Ron Ayres Yamaha online shift drum & 3 shift forks is $275. I think I'd do it all since it's split.