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1978 928 - 9288200072
 
Join Date: Jul 2008
Location: Edmonton, Alberta Canada
Posts: 207
Garage
Cylinder Head removal - 924

My son and I are pulling the cylinder head off our 1979 924 (non turbo). The head gasket is blown and there is water in the combustion chambers (but no oil in the rad thank goodness). We've removed the camshaft cover and removed the 10 bolts holding the head onto the block.

What is the best way to break the head free from the block. We have pulled on the head (with our hands) and tapped it quite hard with a plastic mallet, but it will not break free. Any advice on how to break it free?

Thanks,
Rick
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1978 928 - 5 speed - no sunroof - Copper Brown Metallic - Cork Interior
1979 924 - 5 speed - sunroof - Red - Light Brown Interior (sons)
2005 BMW X5 4.4 - 6 speed auto - Grey/Green - Light Beige Interior
Old 09-24-2011, 08:06 PM
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There are some locator dowels on the exhaust side that the adjacent head bolts go thru at the front and rear that keep the head from slipping sideways. Try prying it up. Make sure the rear coolant hoses are disconnected as they are sort of hidden. Then get the oil press sender electrical and the TT switch at the rear of the head disconnected as soon as the head is free.
Old 09-25-2011, 04:38 AM
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Double check you removed all the nuts and bolts and tap it harder with a rubber mallet while lifting up on the head.
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Rick
93 968 (My summer car),
05 Cayenne S (My winter car),
79 924 (Wife's summer car), 02 C230k (Wife's winter car),
Old 09-25-2011, 04:40 AM
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1978 928 - 9288200072
 
Join Date: Jul 2008
Location: Edmonton, Alberta Canada
Posts: 207
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If I put the spark plugs back in and put the timing belt back on could I turn the engine over and use the compression in the cylinders to break the seal?
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1978 928 - 5 speed - no sunroof - Copper Brown Metallic - Cork Interior
1979 924 - 5 speed - sunroof - Red - Light Brown Interior (sons)
2005 BMW X5 4.4 - 6 speed auto - Grey/Green - Light Beige Interior
Old 09-25-2011, 06:50 AM
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I wouldn't do that, the chance of breaking something is too high.
I've never not been able to get a head off doing as I noted. Triple check you removed all the nuts/bolts inside and out, there could be a hidden bracket or something like that holding it down.
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Rick
93 968 (My summer car),
05 Cayenne S (My winter car),
79 924 (Wife's summer car), 02 C230k (Wife's winter car),
Old 09-25-2011, 07:10 AM
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1978 928 - 9288200072
 
Join Date: Jul 2008
Location: Edmonton, Alberta Canada
Posts: 207
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Got it off. We removed the intake and exhaust manifolds to give us more room to work and got it off without too much work.

Now I can see why it would not start!!



Now we get to clean up all the parts and put it back together with a new set of gaskets.

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1978 928 - 5 speed - no sunroof - Copper Brown Metallic - Cork Interior
1979 924 - 5 speed - sunroof - Red - Light Brown Interior (sons)
2005 BMW X5 4.4 - 6 speed auto - Grey/Green - Light Beige Interior
Old 09-25-2011, 11:55 AM
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Gasket replacement

Now that it's off, make sure you get the head decked, just a light milling. It's worth a couple of bucks just to know that you will have clean compression once it's back together. Clean everything and it the exterior surfaces with a light coat of paint, cast blaster or alumi-blaster. Good luck
Old 09-25-2011, 12:49 PM
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While you have the intake off, change the vacuum lines ( if not done the last few years). Also, never an easier time to clean the grounds on the block next to the bell housing

With the exhaust mani of , it's a great time to reseal the oil cooler.

It's your time and your dime

Bruce
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Bruce P.
1988 951 Alpine White, AutoAuthority chip, HRE custom wheels, 10 speaker panels, Schnell short shifter, M030 sways, Koni Sports
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Old 09-25-2011, 06:56 PM
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1978 928 - 9288200072
 
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I'm planning to redo the vacuum lines, test the different switches/valves and do some cleaning and painting. I don't think there is an oil cooler on the older 924's.
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1978 928 - 5 speed - no sunroof - Copper Brown Metallic - Cork Interior
1979 924 - 5 speed - sunroof - Red - Light Brown Interior (sons)
2005 BMW X5 4.4 - 6 speed auto - Grey/Green - Light Beige Interior
Old 09-25-2011, 08:03 PM
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Correct, no oil cooler - different engine than he's thinking.

I would definitely plan to decarbon the piston tops and valves, and relap the valves in...
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Old 09-26-2011, 04:11 AM
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Yep, forgot you were talking 924. Sorry
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Bruce P.
1988 951 Alpine White, AutoAuthority chip, HRE custom wheels, 10 speaker panels, Schnell short shifter, M030 sways, Koni Sports
"You're the best I ever had" --JJ Cale
Old 09-26-2011, 04:33 AM
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