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I think I killed it :-(
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bureau13  



Joined: 07 Sep 2017
Posts: 352
Location: South Florida

PostPosted: Mon Nov 02, 2020 1:34 pm    Post subject: Reply with quote

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)
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Fasteddie313  



Joined: 29 Sep 2013
Posts: 2180
Location: MI

PostPosted: Mon Nov 02, 2020 1:48 pm    Post subject: Reply with quote

bureau13 wrote:

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?


Um.. Well you have that upgraded turbo breather to the head.. So maybe that, unless you wanna figure out how to drill that yourself..

Other than that, not that I know of..
(pssst, buy another whole longblock)
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bureau13  



Joined: 07 Sep 2017
Posts: 352
Location: South Florida

PostPosted: Tue Nov 03, 2020 8:49 am    Post subject: Reply with quote

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.

Fasteddie313 wrote:
bureau13 wrote:

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?


Um.. Well you have that upgraded turbo breather to the head.. So maybe that, unless you wanna figure out how to drill that yourself..

Other than that, not that I know of..
(pssst, buy another whole longblock)

_________________
-----------------------------------------
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)
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Paul  



Joined: 02 Nov 2002
Posts: 9466
Location: Southeast Wisconsin

PostPosted: Tue Nov 03, 2020 12:42 pm    Post subject: Reply with quote

Pull the head, you have a reasonable chance that everything is reusable but 3 exhaust valves and their guides.
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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.
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bureau13  



Joined: 07 Sep 2017
Posts: 352
Location: South Florida

PostPosted: Tue Nov 03, 2020 2:21 pm    Post subject: Reply with quote

Paul wrote:
Pull the head, you have a reasonable chance that everything is reusable but 3 exhaust valves and their guides.


I'll tackle that next weekend. If I can get started before, I will. I'm pretty slow, especially with stuff I've never done before, so we'll see how far I get.
_________________
-----------------------------------------
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)
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Paul  



Joined: 02 Nov 2002
Posts: 9466
Location: Southeast Wisconsin

PostPosted: Wed Nov 04, 2020 2:10 pm    Post subject: Reply with quote

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.
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bureau13  



Joined: 07 Sep 2017
Posts: 352
Location: South Florida

PostPosted: Wed Nov 04, 2020 4:04 pm    Post subject: Reply with quote

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

Paul wrote:
Spray all the bolts mentioned earlier in this thread with Liquid wrench or PB Blaster a couple of times between now and then.

_________________
-----------------------------------------
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)
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bureau13  



Joined: 07 Sep 2017
Posts: 352
Location: South Florida

PostPosted: Thu Nov 05, 2020 5:32 pm    Post subject: Reply with quote

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)
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Johann  



Joined: 07 Aug 2016
Posts: 230
Location: Netherlands

PostPosted: Thu Nov 05, 2020 10:41 pm    Post subject: Reply with quote

I think 300-500 full a complete head is fair.
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Fasteddie313  



Joined: 29 Sep 2013
Posts: 2180
Location: MI

PostPosted: Fri Nov 06, 2020 3:34 am    Post subject: Reply with quote

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

In working condition, agree.. With good cam and buckets in it, etc..
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MikeDanger  



Joined: 21 Nov 2002
Posts: 579
Location: Denver

PostPosted: Sat Nov 07, 2020 9:51 am    Post subject: Reply with quote

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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bureau13  



Joined: 07 Sep 2017
Posts: 352
Location: South Florida

PostPosted: Sat Nov 07, 2020 3:37 pm    Post subject: Reply with quote

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)
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bureau13  



Joined: 07 Sep 2017
Posts: 352
Location: South Florida

PostPosted: Sun Nov 08, 2020 3:42 am    Post subject: Reply with quote

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)
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bureau13  



Joined: 07 Sep 2017
Posts: 352
Location: South Florida

PostPosted: Tue Nov 10, 2020 9:05 am    Post subject: Reply with quote

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)
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Fasteddie313  



Joined: 29 Sep 2013
Posts: 2180
Location: MI

PostPosted: Tue Nov 10, 2020 9:32 am    Post subject: Reply with quote

No, you don't have to remove the cam...
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