M42 Pilot Bearing

[io_RobbieRodgers]

The M42 does use a pilot bearing, right?

I'm getting to the end of my rebuild, and for the life of me I cannot recall a pilot bearing falling out when I pulled the crank out, and there's nothing inside the flywheel. I would have known if my car was running without a pilot bearing, right? It's kind of necessary, yeah? I hope to God I don't have to tack on another week to this waiting for a bearing to come in the mail.

Complete writeup of rebuilding the M42 is in the works, for those interested.

[io_RobbieRodgers]

Also, how bad of an idea is it to not use a torque wrench when putting everything back together, and guesstimating torque values? This may be a moot question, but has anyone had disasterous results?

[Dj Buttchug]

yes a pilot bushing is used and no it probably didnt fall out of the crank. To best answer your question you do need one... and no. guessing torque values isn't a good idea, especially on things that spin very fast, like flywheels...

[StereoInstaller1]

Get a harbor freight torque wrench at least. On the M42 we are in the middle of building, the pilot bearing DID fall out when we pulled the clutch off the flywheel.

[Ryann]

My clutch kit came with a pilot bearing, not a bushing. Are you really getting to the end of an engine rebuild without a torque wrench??

[io_RobbieRodgers]

Well, there's my answer. Going to HF tomorrow and checking the torque values of the crankshaft.

[io_RobbieRodgers]

Well I checked the values of the bolts today, look like they're all torqued to around 30 Nm, which is 50% more than the 20nm the torque manual specifies. What's the consensus? Do you think the bolts could be compromised?

[AndrewBird]

Which bolts exactly are you talking about? The ones that hold the flywheel to the crank?

If so, it shouldn't be a problem. You are only talking 7 ft lbs extra, which is not much. It's more important that they are tightened equally and not too loose. I would loosen them all back up and re-torque them correctly.

[xwill112x]

Always do your tq #'s correctly or you will regret it when rdore comes into play.

[io_RobbieRodgers]

I was talking about the rod bolts to be more specific.

[aka-e30]

yes 100% rod bolts need to be torqued correctly. If i were you i would just back them off and re-torque them. 7ft/lbs isnt going to strech the bolts any. I take it you still have the engine out of the car? Or havent run it yet?

[Massimo]

This is what happens when flywheel bolts come loose.







IDK how you think it is ok to estimate torques on an engine rebuild.

[Victell]

^^ those bits have also been known to go through the front driver and passengers' lower legs. Ouchie.

[Dj Buttchug]

holy fuckkkkkk

[Massimo]

^
Yes. I think it is a 300zx. I recon the guy is luck to still have toes.