Bent Connecting Rod and Flywheel Question

IAtractorKid · Mar 11, 2018

Hey guys! Finally getting back to working
on my IH 404 utility. For those that don't
remember, it had low compression on two
cylinders, and was burning oil. I am in the
middle of tearing it down for a full
rebuild and clutch job.

First I found that it had two different
lengths of push rods in it. Neither of
which were correct! So I know have 8 new
push rods for it.

I have also found one (for sure) bent
connecting rod. Now, they were going to the
machine shop anyway to be "remanned"...but
is this one salvageable or do I need to buy
another???

Secondly, the flywheel bolts started
wearing into the pressure plate rivets.
Flywheel was going to the shop too to get
re-surfaced. Can the inner bolt surface of
the flywheel be machined to re-establish
the correct step or should I be on the
lookout for another flywheel as well?

Thanks for the insight!

rustred · Mar 11, 2018

bent rod is for the garbage bin. the other ones have a blue ting to them it looks like?? if so they go in the same bin. might be just the lighting on them.? if didnt get hot they can be resized.
flywheel can be resurfaced with the step. need another pressure plate. and go with the lined clutch, those button clutches are hard on surfaces. all depends on the surface wear on the flywheel.

IAtractorKid · Mar 11, 2018

Thanks! Kind of what I thought..

None of them are blue...just the picture lighting.

gene bender · Mar 11, 2018

You say the flywheel bolts are wearing into the clutch plate. The reason they do that is because the flywheel has been machined too deep allowing the disc to be closer to those bolts better get another flywheel also your pressure plate has worn fingers it need to be replaced.

IAtractorKid · Mar 11, 2018

Yep I already have a new clutch disc and pressure plate. So your saying they cant machine the center of the flywheel down to re-establish the correct step?

rustred · Mar 11, 2018

the flywheel could have been machined already... and if they did not stamp how many thou. they removed it is possible it could be at its limit. also dont forget a new disc is thicker so that will allow for a bit of clearance from new, but once the disc gets worn it will rub also. plus you dont know how much meat they need to remove on that flywheel to get it smooth. so you could be hooped before you start. are you using a disc clutch now?

rustred · Mar 11, 2018

you could assemble it on a bench with the new disc and do some measuring. that will answer your question. if you have enough meat there to do the resurface.

charlieu · Mar 11, 2018

(quoted from post at 22:13:25 03/11/18) Yep I already have a new clutch disc and pressure plate. So your saying they cant machine the center of the flywheel down to re-establish the correct step?

Check with a clutch rebuilder, If you ask they would build you a clutch disc with a thicker pad on the flywheel side and a thinner pad on the PPA side. This will give you a little more life from your wore out flywheel.

IAtractorKid · Mar 11, 2018

That's true...guess I could try that and see. I knew you wouldn't be able to tell me for sure one way or another, I just didn't know if they could turn that inner bolt surface to re-establish the step height.

New clutch disc is not a button disc as the old one was.

I'm sure it's been turned before, but it's not stamped anywhere. It is a 351217R31 I think...which appears to be a replacement for 351217R12 which a Super C/230 flywheel. 376810R91 should be a 404 flywheel.

Big Fat Herb · Mar 11, 2018

Does it have the rite bolts and washers holding the flywheel on ?

IAtractorKid · Mar 11, 2018

gene bender · Mar 11, 2018

too much material has been removed and you cannot build it back up check your new clutch plate it just mite be thick enough for clearence but your pressure plate is missing part of one of the fingers from looking at your pics

BarnyardEngineering · Mar 12, 2018

I was scratching my head on this until it dawned on me...

The problem is NOT the "step" from the pressure plate mounting surface to the friction surface.

The problem is the vertical step from the friction surface to the flywheel mounting bolts in the center. There's no machining that will fix that. It might work for a while with a new clutch disk, but eventually as that disk wears down you will run into the same problem again.

Will it ever be a problem? Depends on how you use the tractor. For an everyday farm tractor, you probably should get yourself a better flywheel.

farmall pete · Mar 12, 2018

What about machining down the center section of the flywheel, where the bolts are, to reestablish the correct clearance between the flywheel bolts and the pressure plate? Never heard of that being done (must be a reason why)?

BarnyardEngineering · Mar 12, 2018

You're weakening the main connection between the engine and the tractor by machining the center down. It's the thinnest part of the flywheel to begin with.

IAtractorKid · Mar 12, 2018

You are correct. I have another flywheel
and rod on the way...hopefully they will be
in better shape. This tractor won't get any
use other than a few tractor rides and
parades, but I want it done right.

Bent Connecting Rod and Flywheel Question

IAtractorKid

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rustred

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IAtractorKid

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gene bender

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rustred

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rustred

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