924Board.org

seanski44 · Joined: 13 Mar 2006 Posts: 532 Location: Nottingham UK

Hi all,

Finally got the exhaust off the 931, got the Jpipe out of the way and am really struggling to remove the third hex bolt from the exhaust manifold. you know the one, its the one above the oil filter etc...

Any suggestions? (I've already broken a UJ trying) its had many doses of WD40....
_________________
1998 BMW Z3 2.8 arctic silver & red

1981 168HP 931 S2 blue/tan leather - SOLD

1985 121HP 924 2.0l na modded - SOLD!
1992 968 lux SOLD
1989 944 2.7 lux SOLD

bass gt · Posted: Sat Apr 08, 2006 3:39 am Post subject:

Sean,

Just keep going at it!! I broke 2 UJ's trying to get the 3rd bolt out of my spare engine

It just takes time, brute force, ignorance and a gallon of WD40. One little tip i found. When the two faces start to seperate, squirt WD in there. It seemed to help, although mine came off in tiny increments.
Good Luck,

Steve

John Brown · Joined: 07 Nov 2002 Posts: 903 Location: Leesburg VA

If (and it's a big if) I'm understanding the particular hard to reach bolt (of the many); consider removing the oil filter, adapter and all the oil lines in the way. At which point you can go straight up the side of the block with a long extension.

All that stuff could probably use new O-rings and crush seals anyway. I know mine did.
_________________
John
80 931 - #931 44Cup
99 Escalade - tows track cars
gone but not forgotten: original 924.org car - 82

seanski44 · Joined: 13 Mar 2006 Posts: 532 Location: Nottingham UK

cheers guys, I'll be back under there tomorrow! - might be a good idea to remove all the oil gubbins anyway (yes you've got the right bolt!)

Pray for the good weather to remain!
_________________
1998 BMW Z3 2.8 arctic silver & red

1981 168HP 931 S2 blue/tan leather - SOLD

1985 121HP 924 2.0l na modded - SOLD!
1992 968 lux SOLD
1989 944 2.7 lux SOLD

seanski44 · Joined: 13 Mar 2006 Posts: 532 Location: Nottingham UK

Actually, while I'm at it, the goal is to remove the head, as the car was bought as a cambelt failed non-runner. I am doing the righ thing in removing the head with the ex mani attached (in the same way as I did with the n/a) ?

btw, what's the worst case scenario for snapped cambelt? - (I have a spare 931 head but it may not be in as good condition as the one that's in place)
_________________
1998 BMW Z3 2.8 arctic silver & red

1981 168HP 931 S2 blue/tan leather - SOLD

1985 121HP 924 2.0l na modded - SOLD!
1992 968 lux SOLD
1989 944 2.7 lux SOLD

-nick · Joined: 16 Nov 2002 Posts: 2699 Location: Cambridge, MA

Removing the head with the exhaust manifold attached is definitely the best way. You'll have a tough time with some of those manifold-to-head nuts even with it out of the car.

Absolute worst case scenario with a snapped timing belt = cracked head, scored cylinder walls, broken piston(s). Your valves are very likely bent. If the head of one snapped off then it could have scarred the cylinder walls badly and could even crack a piston. Most likely, you just have bent valves...

ps- PB Blaster works much better than wd40!

nick

seanski44 · Joined: 13 Mar 2006 Posts: 532 Location: Nottingham UK

seanski44 · Joined: 13 Mar 2006 Posts: 532 Location: Nottingham UK

Update,

well, my brother came round to help and while he held the torch, squirted the WD40 and held a spanner up there to keep the UJ as straight as poss, I attacked (gently) with my 18" torque wrench...

Looked into removing all the oil pipes etc, but having removed the filter, we realised that on the RHD the steering knuckle is in the way of getting the pipes off...

anyhow, with a lot of grunting we noticed that I was actually pulling the head of the bolt to one side rather than turning it. The up side of this was that we were able to get some WD40 in under it in one of these moments, and we slowly managed to make it turn about one revolution before April showers set in and stopped the show... well, a bit of rain would have been fine and wouldn't have stopped us, but it began hailing! - anyway, it cleared up once my brother had gone back to his family of course! - back at it again tomorrow...
_________________
1998 BMW Z3 2.8 arctic silver & red

1981 168HP 931 S2 blue/tan leather - SOLD

1985 121HP 924 2.0l na modded - SOLD!
1992 968 lux SOLD
1989 944 2.7 lux SOLD

seanski44 · Joined: 13 Mar 2006 Posts: 532 Location: Nottingham UK

bolt off, now made a start on the head bolts, one of which is rounded

will post in the 931 tech sec but any advice is welcome. Looks like someone reused the original bolts at some point, or else attempted to remove them and failed miserably...
_________________
1998 BMW Z3 2.8 arctic silver & red

1981 168HP 931 S2 blue/tan leather - SOLD

1985 121HP 924 2.0l na modded - SOLD!
1992 968 lux SOLD
1989 944 2.7 lux SOLD

Khal · Posted: Tue Apr 18, 2006 9:58 am Post subject:

Sorry, missed this thread.

We recently had exactly the same problem with my car. Removed the oil cooler, etc... (as John Brown suggested) to get a clear run at the bolt. Sprayed it liberally with penetrating oil. Much elbow grease finally saw it come loose, no damage.

I think the trick is to leave the other two bolts in and attack the third bolt first...
_________________
'80 924 Turbo

seanski44 · Joined: 13 Mar 2006 Posts: 532 Location: Nottingham UK