Many M42 questions.

[ccsdo5]

So I'm fully rebuilding my M42, and I plan on documenting almost everything when I do it for future reference. But I'm going to have many questions since 1. this is the first engine I'll ever be building and 2. I'm a dumb punk teenager with only about half an idea of what I'm doing.

- Does anybody know the torque spec, and bolt pattern that is needed for the crank shaft Main caps? I can not find it anywhere...

- Has anyone converted to solid lifters? I was possibly looking into going that route, since I'm fully redoing the head anyway. Is there any benefit to going with solid lifters?

http://store.034motorsport.com/lifter-solid-for-audi-vw-motors-1467.html

These were the ones I was looking at, not sure If they are the correct size or not. Just something I stumbled upon on another forum.

Those are really the only questions I have right now. Thanks for any help guys!

[kwill22]

Chiltons M42 manual has all the engine info. It's for the E36 but the same engine.
As for the lifter argument, search the m42 section. Theres a pretty decent amount on it.

[Brilliantrot 318is]

http://bmwfans.info/parts-catalog/E30-2-doors/USA/318is-M42/L-M/mar1991/browse

^ I have been using this site for the past 4 years. and if it was't for this site I'd be very lost.

-----------------------------
Tightening Torques

-Pulley to vibration damper......................... 22Nm (17ft-lb)

-Vibration damper to crankshaft
M16 stretch bolt (always replace)................330 Nm (244 ft-lb)

-Flywheel to crankshaft (use new bolts)....... 120Nm (89ft-lb)
------------------------------

Good luck. I hope this helps. I pulled this info out of the "BENTLY 3-SERIES SERVICE MANUAL (E36)" I have the book, but you can also source the PDF online.

[ccsdo5]

Thanks, for the specs! I actually already have those values. I downloaded the e36 bentley manual for the M42 a while ago and have one for the e30 chassis too. But after looking everywhere in it I still can't find the torques I need.

I'm looking for the Main Cap torque values and pattern. The crankshaft is out of the block right now because it was getting machined at a machine shop. I also wanted to replace the main bearings since I'm fully rebuilding the thing. I'm just kind of baffled the Bentley manual doesn't have that in it. I still can't find it :( and I need to soonish because I plan on putting everything back together as soon as I get it back this week hopefully!

[TobyB]

Shit, if you believe the General instructions,
20 NM,
and then 50 degrees.

Huh.

That comes up in a lot of places- the 50 degrees has me wondering if the main bolt
is a TTY- it's not the typical TTY (90 +90 or 60 +60) number...

Anyway, there's your answer... I used Google...

t

http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=12&cad=rja&ved=0CC0QFjABOAo&url=http%3A%2F%2Fwhatismycar.com%2Ffiles%2Fbmw_bolt_torque_specifications.pdf&ei=xbP7UsXPG8adqAHe1YCwDQ&usg=AFQjCNHIQErtfytNKynIpkhPvyp_rmQN1g&sig2=5uNK8-hiNVnWGVu72O9oTw&bvm=bv.61190604,d.aWM

[ccsdo5]

well that is the second place I've seen 20NM and the 50 degrees. So I guess it must be correct. But it just seems so low for the crankshaft, which is really why I asked. I found it on this website

http://workshop-manuals.com/bmw/3_series_e36/318is_m42_coupe/4_tightening_torques/11__engine_(m42)/11__engine_block/1_azd__engine_block/

But I have no idea how reliable that site is haha. I mean also used google, I'm not totally incapable I was just kind of looking for some input from others since it is the first time fully rebuilding an engine and would prefer to ask questions instead of just winging it. Thanks! really appreciate it!

[TobyB]

Yeah, it seems odd to me, too, but a decent number of non- stretch bolt applications
have gone to the 'initial torque and limited angle' method- M10 head bolts being one of
the more common.

I bet you'll find that 50 degrees brings it up into the 40- 50 ft- lb range, which is a very
reasonable average number for most main bearings.

hth

t

[ccsdo5]

Okay so last night I put my ARP main studs in and also the main bearings, crank, and main bearing caps. I torqued everything following the ARP instructions and I know the thrust bearing is in the correct spot and what not.

What I noticed is that the crank will slide back and forth a little bit. Is this normal? I am worried about crank walk. Could it be because I don't have the rear main seal, oil pump housing and other stuff on?

Any advice or knowledge would be awesome, Thanks!

[AndrewBird]

Lots of useful info here:

http://www.e30tech.com/forum/showthread.php?t=59017

That says .003-.006" of play, so very little.