924Board.org

McMichem · Joined: 26 Jun 2015 Posts: 38 Location: Buffalo NY

I finally got the j pipe and the bottom bolt of the manifold to turbo flange off now that I've had a day off and I am having some new issues. I am finally ready to remove the head bolts... But of course it isn't ever that simple with this car...

I went and purchased a 10mm hex head socket from Home Depot and sprayed the bolts down with some on blaster and let them sit for a bit. I cleaned out the oil from the inside of the hex' and try to take one off. They are as soft as butter and the first one I try to remove(#10 in Haynes) immediately strips out with hardly any force at all.....

Not even sure where to go from this point, I don't want to strip any more.

_________________
1980 931 ~ 67,000 miles

FUN2DRV · Joined: 07 Dec 2014 Posts: 19 Location: Southest CT

I would hit the bolt head sharply with a hammer, then use a good quality socket (SK, Snap-on, etc). Hopefully with a good allen wrench socket it will grip the flats better and get the job done.
_________________
'81 931
'87 944 N/A

fiat22turbo · Joined: 18 Jan 2006 Posts: 4040 Location: Portland, OR

Are you sure they are Allen heads and not triple square heads?
_________________
Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose)

McMichem · Joined: 26 Jun 2015 Posts: 38 Location: Buffalo NY

I'm gonna try that when I get home @fun2drive, I had lightly hit it to tap iron originally and had no luck, maybe a little more force will save the others.I've always been doing a little searching and if for some reason I can't get them off easy enough I will probably go buy a air hammer and try to chisel one out like a lot of other forums have been suggesting for stripped Allen heads. Although I would prefer not to.

Fiat: It for sure is a 10mm Allen, I did a lot of research on head removal on our 2.0s before I started this and felt confident about it, got mixed answers on whether it should have been the triple square or a 10mm hex. It is the hex but unfortunately they are still stripping, I only stripped the one and then decided not to continue until I had a plan of attack.
_________________
1980 931 ~ 67,000 miles

McMichem · Joined: 26 Jun 2015 Posts: 38 Location: Buffalo NY

Would the Allen heads suggest they are not original and the head has already been off?
_________________
1980 931 ~ 67,000 miles

fiat22turbo · Joined: 18 Jan 2006 Posts: 4040 Location: Portland, OR

I broke some 3/8" extensions before I finally bought the 1/2" drive bits I needed:

Make sure the bit is fully seated (give it a tap with a hammer) and backing the bit up slightly can help break the tension.

Worst case, drill the heads out and move on with it.
_________________
Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose)

McMichem · Joined: 26 Jun 2015 Posts: 38 Location: Buffalo NY

Ouch...

Got home from work and re-soaked them with PO and I tried getting 2 more out and they came out alright, maybe the one was overtorqued. Lets hope, I'll get back to the stripped one later

Here is a picture of one of them, they obviously aren't original?

_________________
1980 931 ~ 67,000 miles

Ian89C4 · Joined: 01 Apr 2011 Posts: 561 Location: North Carolina

They are original. The early turbo motors had them, just pulled the head on my 80 turbo project and she had the same ones.

The turbo FSM portion mentions them.

Hopefully it was just a little corosion, but a po could have snuck in there and tried re-torqueing them.
_________________
Ian Edgerly
North Carolina

Current:
1981 924 SCCA/ChampCar Weissach Race Car ("Serenity")
1987 924S ChampCar Endurance Car ("Der Weg")
1980 924 Euro ("Wahala")

McMichem · Joined: 26 Jun 2015 Posts: 38 Location: Buffalo NY

I ended up really tapping the bit in and I ended up getting it out. Out of all of them it was the only one that was very corroded.

Ready for the head to be removed, figured it would lift right off and it did on the front side. I gently set it back on and put 2 bolts back in so it wouldn't slide all over.

I think my flange on the j pipe is all seized together so I sprayed it down and I'll wait tomorrow. If I recall I should just be able to get a hammer and extension and tap the studs poking down from it to break the connection?
_________________
1980 931 ~ 67,000 miles

McMichem · Joined: 26 Jun 2015 Posts: 38 Location: Buffalo NY

Finally got the head off and this is what i'm looking at, should be able to click the pictures for a bigger size. My normal image uploading site is down so I had to use another thats only posting as thumbnails.

What do you guys think? obviously damage on #3 I think it is. The piston has been chewed up a bit but the walls look alright from the brief minute I looked.

_________________
1980 931 ~ 67,000 miles

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

Looks like typical failure on cylinder three. Hard to tell from the pix, but there appears to be signs of gasket failure between 3 & 2, as well as at the bottom of 3 (nearest the exhaust mani). Also difficult to tell from the photos, but the damage on the piston crown and the head combustion chamber could be detonation damage, or maybe something got ingested into that combustion chamber. From what I can see of the cylinder wall on #3, it appears unscathed.
_________________
erstwhile owner of just about every 924 variant ever made