924Board.org

[bureau13]

Yeah that's what I was afraid of. I didn't expect 0 compression on two or more cylinders but I guess it makes sense.

What you're saying about getting an entire used head makes sense as well. Does it matter what year? Or do i need to make sure it's at least a Serious 2 head?
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1982 931
1986.5 Silver 928S
2007 Hummer H3 (Daily Driver)

Past lives (I miss them all):
2004 RX-8 (Wrecked)
1993 RX-7 (Sold)
1987 RX-7 Turbo II (Sold)
1985 RX-7 GSL (Stolen)

[Fasteddie313]

[bureau13]

Oh, I guess that is a difference. Dammit.

I get the appeal of having the long block, but I'm not sure where I would put it. I'm space-limited. Although I guess it depends what I'm able to find. Maybe I'll get this thing off and the head itself will be OK? I really don't know what to expect.

[Paul]

Pull the head, you have a reasonable chance that everything is reusable but 3 exhaust valves and their guides.
_________________
White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.

[bureau13]

[Paul]

Spray all the bolts mentioned earlier in this thread with Liquid wrench or PB Blaster a couple of times between now and then.
_________________
White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.

[bureau13]

Good idea, I imagine some of them haven't moved in a while!

[bureau13]

A local guy I know who used to deal in used 944 parts had a contact who actually has a 931 head and also a long block. However he asked my friend what they're worth. I guess they're both rare, and with little demand. I have no idea what to tell him. I saw a perfect fully refurbed one for $2K in the UK, which is way too much but it did look nice, and I see some use ones of unknown condition for $299. Quite a range.
_________________
-----------------------------------------
1982 931
1986.5 Silver 928S
2007 Hummer H3 (Daily Driver)

Past lives (I miss them all):
2004 RX-8 (Wrecked)
1993 RX-7 (Sold)
1987 RX-7 Turbo II (Sold)
1985 RX-7 GSL (Stolen)

[Johann]

I think 300-500 full a complete head is fair.

[Fasteddie313]

[MikeDanger]

I had a somewhat similar thing happen, the crank bolt came loose (I never touched it) and it bent 2 valves. I got the replacement valves from EBS I think. but this was a few years ago. the pistons were fine
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It was either this or a giant box of legos

[bureau13]

So let's say for the sake of argument that I have a few bent valves and that's it. Given that I can't seem to find replacement valves anywhere, would you guys just find used valves somewhere, or (depending on the number required/cost) maybe buy a head to scavenge?

Any other parts I need to get that should be replaced as part of the "valve job?" I'm betting no shop that I take it to is going to have the right stuff on hand, so I may as well get it myself. I'm not talking head gasket or the ARP head studs as discussed earlier, since that comes into play when I put the rebuilt head back in the car, but rather items that should be replaced by the shop rebuilding it?

I've never had to have a head rebuilt, obviously...
_________________
-----------------------------------------
1982 931
1986.5 Silver 928S
2007 Hummer H3 (Daily Driver)

Past lives (I miss them all):
2004 RX-8 (Wrecked)
1993 RX-7 (Sold)
1987 RX-7 Turbo II (Sold)
1985 RX-7 GSL (Stolen)

[bureau13]

FYI I can find new valves when I search by part number...for like $130-$150 each

At two of those I'm at the consensus lower bound on entire used heads. Yikes.
_________________
-----------------------------------------
1982 931
1986.5 Silver 928S
2007 Hummer H3 (Daily Driver)

Past lives (I miss them all):
2004 RX-8 (Wrecked)
1993 RX-7 (Sold)
1987 RX-7 Turbo II (Sold)
1985 RX-7 GSL (Stolen)

[bureau13]

In between raindrops from Tropical Storm Eta I was able to compression test the rest of the cylinders. I get no compression on 1, 3 and 4, and 120 on 2. Yay, my tester works...

I'm not sure how much you can tell from one cylinder reading when you can't compare to the others...I would say it seems a bit low, if anything, right?

I have a question about head removal. From the discussion in this thread and others I've read, I gather it's best to leave the exhaust manifold connected to the head until after you've removed it. I assume the intake manifold would come off first, but do you need to remove the cam and all of that stuff? I ask because it wasn't mentioned but Haynes has this fairly elaborate process of removing all sorts of parts, keeping them in order, etc and THEN removing the head. I assume that's because they were assuming all the rebuilding was being done by the person following the procedure, rather than either sending the head out or simply replacing it, but I want to make sure.
_________________
-----------------------------------------
1982 931
1986.5 Silver 928S
2007 Hummer H3 (Daily Driver)

Past lives (I miss them all):
2004 RX-8 (Wrecked)
1993 RX-7 (Sold)
1987 RX-7 Turbo II (Sold)
1985 RX-7 GSL (Stolen)

[Fasteddie313]

No, you don't have to remove the cam...
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80 Turbo - Slightly Modified