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End Game
I've given some thought to my end goal with this motor and decided the objective will be to rebuild it as a primarily stock S4 motor with some updates here and there. The thought would be to create a spare motor for the GTS if needed or sell it someday with a clean bill of health. This does not change the immediate plans to pull the heads and inspect the head gasket though.
Face Off
Today I started removing the stuff from the front of the motor which was filthy from years, decades, of oil and grime compacted into every nook and crany. The timing belt, cam sprokets, oil pump and crank gear all came off without too much drama. Neither the crank main seal, nor the oil pump seal had any evidence of leaking, infact those were some of few dry clean areas. My guess oil mess on the front was from leaking valve cover gaskets. Here is a photo of the face of the motor all cleaned up. It's nice to see all the mounting holes and threads in good condition and no broken and stripped bosses so far.
You can see the metal impeller on the Laso water pump has rusted and has stained the block. I am wondering if there is a safe method for removing rust stains from the block.
1R Head Connundrum
Next up, I'll work to remove the heads. The heads on this motor are 9281044131R, I have read a little bit about these heads being prone to cracking and that in the 1989+ cars the heads were reinforced under the head bolts. I am curious if the 1R heads are viable rebuilding candidates or are they not worth the effort because of the cracking issue?
Early 1R heads are a true conundrum.....what to do?
Wish I could help,
as I know a bunch about this topic....
But because Hacker is threatening to ban me because I allegedly was making political statements in a post about emission equipment and EV's (how what was said is political I, nor anyone else who has read it, has zero idea), I have to be really careful with what I say.
Because after him doing this twice to me, it is obvious that almost anything I say he could pervert into being a political statement.
(It is obviously a personal vendetta, since he refuses to answer any of my inquiries to rationalize his "judgement".)
I'm sure that Hacker knows all about this cylinder head issue,
or he can ask Todd.
I'm betting that he's seen dozens of failures, like I have....
And BTW...for all moderators:
If you pass judgement on something or somebody and refuse to explain why (and it makes absolutely no sense),
there's very little option but to go public!
My post was also deleted. I think the nice thing with enthusiasts all over the world is the small talk about different culture and behavior, like the discussion about driving rules for learners.
But as a German, I can‘t imagine a company could be sued if a client put a hot coffee in his lap and the mug hasn‘t a warning print on it.
It took me a while to read up in the manuals on how to remove the cams appropriately and I watched a couple of German videos of 944s2 folks that were really helpful. With that accumulated insight I dug in and was able to get one of the heads off the motor. The head looks to be in really good condition. I was not able to find any surface cancer as others have noted lately in some scary head gasket repairs. I am curious how I should go about cleaning the piston walls and pistons. There was some water that dripped into several pistons from the head removal process. I blew it out with compressed air. Should I spray it down with Wd40 or oil or something? I'd appreciate some guidance on cleaning
I used a utility knife blade to scrape off the head gasket residue, I am not seeing any pitting to my untrained eye.
Last edited by Michael Benno; 12-21-2022 at 01:14 AM.
Good catch Kevin! I cleaned up the area and took some additional pictures. There definitively seems to be some corrosion that has eaten into the head in this area. Easy to miss.
At some point, I will need to rely on a head rebuilding service for these heads. Do I need to find a vendor that specializes in Porsche heads or will anyone with credible experience with this style of head (double overhead cam, hydraulic lifters) be sufficient? I have quite a few head rebuilding vendors available locally.
I would not do anything about that pitting. It is not in the fire ring or any other sealing area. In LA I was able to find a shop that had a lot of experience with 928 heads. In Honolulu there is no such thing so I just used a reputable machine shop that I had used before and liked. Both worked fine.
Once you take apart the heads and get them glass beaded
Not a fan of glass beads anywhere near engine internals, too many nooks and crannies (and oil passages) in a head to trap glass beads. Soda blasting would be better.
12-18-2022, 06:02 PM
Long term plans and Face off
