Flywheel M38

elias929 · Post by **elias929** » Tue Sep 24, 2013 4:14 pm

Hi Guys
I make a mistake, i did not make a mark on my flywheel before removing, i see that there are two possibility, the flywheel is it balanced only one or with the engine. Is it possible he can cause vibration if it is reverse.

Thanks!

Post by **wesk** » Tue Sep 24, 2013 9:32 pm

The crank and flywheel are balanced together. If your flywheel is the earlier flywheel with timing marks just put #1 TDC on compression and put the timing marks on the right side of the engine.

If no timing marks then you can only hope you get it right or the balance is not far off.

elias929 · Post by **elias929** » Wed Sep 25, 2013 6:11 am

Thanks Wes, the timing marks is it close the ring gear!

If yes, is it possible to see the marks by the starter, because the transmission is reassembled.....

Bretto · Post by **Bretto** » Wed Sep 25, 2013 6:27 am

Check the mating surfaces of the crank and flywheel, they may have made a mark on each other that you can match up.

Post by **wesk** » Wed Sep 25, 2013 8:23 am

Then you are assuming the flywheel and crank are original to each other on this half century old jeep!

You can see the timing marks through the inspection window on early engine or through the starter opening on later model engines.

elias929 · Post by **elias929** » Wed Sep 25, 2013 9:05 am

If I understood correctly, I put number one piston in compression and the mark on the flywheel must be the right side (passenger) and is possible to see by the starter or by inspection window!

I have a little little vibration on the engine but i suspect the engine mount because i changed for the news but is not the original mount and he is very stiff and i think he can make this little vibration. Is possible!!

Post by **wesk** » Wed Sep 25, 2013 9:20 am

Yes and yes.

You can often feel things through the frame and body you didn't feel before when replacing old soft mounts with new relatively hard ones.

elias929 · Post by **elias929** » Wed Sep 25, 2013 9:54 am

I replace for my old motor mounts to evening for check this little vibration!

If the motor mounts this little vibration problem is it best to looking for the original motor mounts (less stiff)

When the flywheel is fixed in inverse, is it a very big vibration!!

Thanks,thanks Wes.....

Post by **wesk** » Wed Sep 25, 2013 10:04 am

I would allow the new mounts to age and soften on their own first.

Sometimes there can be slight vibrations and sometimes none at all. Every flywheel/crankshaft mated installation will not behave the same. I have rarely felt any vibration issues on engines assembled with different than original crank to flywheel mating. When I did I either lived with it or reversed the fly wheel or sent the crank and flywheel to the engine machinist to be balanced as an assembly.