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imprezasvx
 
Join Date: Oct 2015
Location: Westcoast Canada
Posts: 47
rebuild head / main bearings rings

Valve seals need replacing. 60,000km S2.

Should I just do a head rebuild or
A) do engine out + get piston rings/bearings all at once?
B) engine in + " " " "?

There are no apparent issues with main block but just thought it'd be nice to do everything at once if it's not too pricey. Reason being I don't have cherry picker or engine stand (these two equipment alone would cost $500).
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1990 944 S2 westcoast
X-mechanic
no Porsche specialty tools- yet
Old 02-11-2017, 10:29 AM
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Join Date: Mar 2008
Location: Rancho Cucamonga, CA
Posts: 3,505
thats very low miles for needing a head.
i wouldn't bother touching the bottom end of the engine at only 60k km.

just pull the head and have it refreshed...have machine shop inspect valve guides to see if they need to be replaced at the same time. unlikely but "while you're in there"...
Old 02-11-2017, 06:14 PM
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imprezasvx
 
Join Date: Oct 2015
Location: Westcoast Canada
Posts: 47
Correction 60,000miles, but yeah I guess that's still kinda low.
Any way to tell if the guides need replacing without going to a shop?
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1990 944 S2 westcoast
X-mechanic
no Porsche specialty tools- yet
Old 02-12-2017, 12:43 AM
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Join Date: Jun 2014
Posts: 664
Could you fill the cylinders to hold the valves and use a lever, not c-clamp, style valve spring compressor to change the guide seals? Since your an S2 it would be wise to change the cam chain and pads with the cams out.

If you pull the head, your parts/gaskets/seal list would get somewhat extensive.
Old 02-12-2017, 04:56 AM
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imprezasvx
 
Join Date: Oct 2015
Location: Westcoast Canada
Posts: 47
Head gasket is likely in need, hence the venture.
I'll skip the main bearings this time.
Anyone know how to check valve guides?
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1990 944 S2 westcoast
X-mechanic
no Porsche specialty tools- yet
Old 02-14-2017, 09:12 PM
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Join Date: Dec 2015
Location: Pound, VA
Posts: 994
Garage
Checking valve guides is easy. Just lower the valve to the open position and move the valve by hand from side to side and up and down. There should be very very little movement if any at all. If they fell tight, they're good. If there's noticeable slop, you'll need guides. However, with that low mileage, I doubt that they'll need to be replaced.
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87 944N/A since 1992
87 944S - Near Future Engine Project Car
88 944S - Current Project
84 928S - Restoration Project
Old 02-15-2017, 06:24 AM
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