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1987 944S Complete head rebuild... HELP!
I just got a 1987 944S that needs a complete head rebuild. Apparently the TC tensioner failed and junked the top end. Where can I go, what book/video can I buy that will give me step by step instructions on how to rebuild the top end?
What parts do I need? where should I start? what tools do I need? I'm mechanically inclined but I have never worked on this engine before... although I have browsed its schematics. 
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02-06-2009, 07:40 PM
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Greasy Member
Join Date: Mar 2006
Location: Indiana
Posts: 1,457
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Do you have access to a shop press and the S head fixture tool?
I say that, because the S ans S2 heads are virtually impossile to rebuild without the proper tools. The retainers and keepers are recessed deep into the back of the head making most valve spring compressors useless! Just removing the valves takes me almost 45 minutes, and I've done over a dozen of them now! -Nick
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Owner: Bennington Motorsports www.benms.com Sponsor for Midwest Region 944-SPEC racing series -When was your timing belt changed or tensioned?? -Yes, I'm the crazy man that will loan out my 9201. Just PM me, I will add you to the list and get it out ASAP. |
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02-07-2009, 05:03 AM
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meister member
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I would just send it to many944s for a rebuild. He offers the best prices around. He did replace the valve seals on my 8V head and did a great job.
Speedy 
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1983 944 guards red with 16" Fuchs, Host of Wisconsin area timing/ balance shaft belt tensioning party 1987 944S Purchased from Legion. Corvette LT-1 V-8 conversion with Mega Squirt II Check on progress ---> www.porschehybrids.com/gallery/speedracing944 Favorite Road = www.tailofthedragon.com 318 turns in 11 miles (11 min 20 sec best run) |
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02-07-2009, 05:08 AM
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Greasy Member
Join Date: Mar 2006
Location: Indiana
Posts: 1,457
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Thanks speedy!
I'm all for people learning how to upkeep these engines on their own. In this situation I was simply trying to warn that without the proper tools, more harm can come to the head than was already done! Not to mention how easy it is to put an eye out without the right tools when valve springs are involved! Endat, if you are interested in having me rebuild your head, you can find more info on my webpage http://benms.com/944head.html. You can ship the head to me, I will remove all the valves check them all for any bend, measure the valve guides and zyglow the head for cracks. Inspection on an S head runs $100, if the head is rebuildable, and you choose to do so, that $100 inspection fee goes toward the rebuild price. LMK! -Nick
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Owner: Bennington Motorsports www.benms.com Sponsor for Midwest Region 944-SPEC racing series -When was your timing belt changed or tensioned?? -Yes, I'm the crazy man that will loan out my 9201. Just PM me, I will add you to the list and get it out ASAP. |
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02-07-2009, 08:31 AM
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Thanks many944s! The head is definitely cracked at the oil tensioner, quite badly.. I even have a chipped tooth on the exhaust cam. I'm not exactly sure if it's rebuildable.. I haven't gone further than removing the valve cover and removing the timing chain and broken plastic.
I guess it needs to be replaced or seriously rebuilt. If it sounds like something you would be interested in, then I am definitely interested in that solution... if not, maybe I can purchase one and send my broken one as a core for replacement. |
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02-11-2009, 05:29 PM
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Registered
Join Date: Oct 2006
Location: CA
Posts: 99
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I'm sorry - that really sucks. If you still have the chunk of aluminum that cracked off, you could take it to a good welder and ask if he/she can weld it back together, or if they know someone who can.
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'87 951 | '87 951 | '87 944 | '93 968 | '84 944 | '82 911 '82 300TD | '77 6.9 |
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02-12-2009, 12:04 AM
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Registered
Join Date: Apr 2007
Location: Napa Valley, CA
Posts: 374
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Quote:
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'88 Rothman Turbo Cup '91 951S Cabriolet Clone |
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02-12-2009, 04:52 AM
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here's a picture of the crack in the head... is this repairable?
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02-13-2009, 03:43 AM
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Greasy Member
Join Date: Mar 2006
Location: Indiana
Posts: 1,457
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Sorry I haven't been on in a couple of days, my daughter has had the flu, and I left bright and early this morning for Indy to pick up roll cage tube stock...
Provided the broken spark plug tube in the photo above is the only broken section, it sould easily be welded. *however* it is very possible that there is a hidden crack beneath that broken piece (near the base of the tensioner) that would be very difficult to repair, only cleaning and crack checking would reveal that. From your post back, I would stay ontop of the head on evilbay! If you can get it for a reasonable price, that would be the easiest way to get you back on the road. I have purchased from that seller before, and had no problems. If you do pick up that head, I would suggest cleaning the head, having it checked for cracks, check the guides and seats and install new valve seals. If you have any questions, feel free to drop me a line! -Nick
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Owner: Bennington Motorsports www.benms.com Sponsor for Midwest Region 944-SPEC racing series -When was your timing belt changed or tensioned?? -Yes, I'm the crazy man that will loan out my 9201. Just PM me, I will add you to the list and get it out ASAP. |
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02-13-2009, 10:25 AM
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