f134 flywheel timing

i've got my flywheel of to replace the ringgear, is there a certain way the flywheel and dowl pins are timed all my liturature
only says instal and tighten dowl pin nuts first.

 

Did you mark the flywheel and end of crank before removal so you could put it back the way it was originally balanced?

 

I marked it but noticed that it has probably been off more than once and wanted to be sure it is right.

 

If it were mine, I would crank it up without the tranny connected and check for excessive vibration before going any further. If you have the tools I would check for flywheel run-out. (Do this before start-up.)

 

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Flywheels are balanced to match the crankshaft balance. If the crankshaft and flywheel are neutral balanced this would be true but this is seldom the case. Therefore flywheels must be installed on the crankshaft to keep the balance correct.


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Nick is correct. The manual you use normally for the F134 on a CJ5 is the SM-1046. My copy is dated 8-71 and on page 59 Para D-67 titled Flywheel says:

The majority of vehicle engines built in the last 70 years or so are done this way. Many necessary procedures that should be accomplished when replacing certain parts is not always specifically addressed in service manuals. It is often an industry common knowledge issue and it "Goes without saying, if the mechanism is balanced then changing a part of the mechanism usually requires you to re-balance the mechanism. I would estimate that at least 1/2 of all engines privately rebuilt are not re-balanced. This is a choice people make. The shop which must warranty it's work will always recommend that it get re-balanced at overhaul and anytime a component of the crank's rotating assembled mass is replaced with a different part.

As an aside, many engines can be balanced without dis-assembly.

 

I tried running it with the flywheel in both positions and it doesn't make any difference on the vibration. I need to replace both front and rear seals so I thought balancing the crank and
flywheel assembly might help, what are any of your thoughts or past experiences.

 

seems if its the original and you put it on the same way it came off then you dont have to re-balance it.

 

I agree.


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