Head Gasket

Side valve, 803, 948, 1098., 1275 and Vizard mods

Head Gasket

Postby Corn22 » Mon Jan 09, 2017 9:48 am

I fitted a new head and gasket to my engine and torqued it up according to the book. But once in and filled with water the head is leaking near the front so I assume I have done something wrong. Looking through various posts on the internet I lightly greased both sides of the head gasket as it seems that is what people do but should I have done that? Also the gasket has not top marking on it but I thought it should be copper side up, is that correct? Any other points I should look at?

Thanks
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Re: Head Gasket

Postby Lurch » Mon Jan 09, 2017 9:54 am

Are you sure you have the correct gasket?
I made that mistake with a metro once! :oops:
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Re: Head Gasket

Postby Corn22 » Mon Jan 09, 2017 10:03 am

Lurch wrote:Are you sure you have the correct gasket?
I made that mistake with a metro once! :oops:

Got the set from ESM for that size engine
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Re: Head Gasket

Postby Rick1963 » Mon Jan 09, 2017 12:47 pm

It may be a good idea to check if the head is flat with a good straight edge. Yep it's copper side up. Have you tried retorqueing the head after the first heat cycle?
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Re: Head Gasket

Postby Panky » Mon Jan 09, 2017 2:37 pm

Also check the leak is not coming from the thermostat housing and dribbling down,
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Re: Head Gasket

Postby Corn22 » Tue Jan 10, 2017 9:27 am

Checked the head and block and it all looks straight. I am sure it is not coming from the thermostat housing. It is weeping out onto the lower bit of the block that sticks out bottom right in the last picture.
I have another head gasket I am going to try, shall I just try this one without grease?

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Re: Head Gasket

Postby philthehill » Tue Jan 10, 2017 3:05 pm

There does seem to be a sign of coolant staining around the front N/S part of the block.
I would put an engineering straight edge over that area and check if you can get a feeler gauge between the top of the block and the straight edge.
I would suggest that if you can get more than 0.003 between the block will need attention.
Do the same for the head.
Note: the use of a steel rule will not give a satisfactory result as the steel rule can bend and distort the reading.
I note that you have the later cylinder head studs fitted. Provided that you have the flanged nuts these can be torqued to 50 lb/ft.
These later studs can be identified by either a pointed top, stamped 'Y' on top or a dimpled top.
I would lightly grease the new gasket and re-torque after the first heat cycle.
Whilst I doubt that it is - make sure that the cylinder head is not making contact with the top of the water pump.
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Re: Head Gasket

Postby Custard » Tue Jan 10, 2017 7:01 pm

Are there indentations around the hole bottom right in that gasket?

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Re: Head Gasket

Postby philthehill » Wed Jan 11, 2017 8:43 am

I would suggest that the head gasket in the last photo is new and has not been torqued down.
There are indentations in the gasket around the hole bottom right which is normal for sealing the oil transfer passage from block to head.
If you max zoom the top of the block photo without gasket it can be clearly seen that there is coolant flow staining between the block to head coolant transfer hole and the edge of the block. It appears to go around the oil transfer passage.
Again on very close examination there appears to be no damage to the top of the block in this area but it still needs to be checked for flatness/trueness.
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Re: Head Gasket

Postby cardiffrob » Wed Jan 11, 2017 1:22 pm

Just a thought from far out on the left field....is the stub on the waterpump too high so that it bottoms out on the water bypass before the head bottoms out on the gasket???
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Re: Head Gasket

Postby pucketsport » Fri Jan 13, 2017 4:00 am

maybe a silly question but I noticed that the new gasket I purchased for my 948 has no markings to show top or bottom. It was purchased from Moss and has a copper colour on one side and silver on the other. Should the copper side face up ?
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Re: Head Gasket

Postby woodywoodchipper » Fri Jan 13, 2017 5:00 pm

usually, yes,
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Re: Head Gasket

Postby pucketsport » Sat Jan 14, 2017 2:43 am

Thanks very much :)
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Re: Head Gasket

Postby Corn22 » Mon Jan 16, 2017 1:23 pm

Thanks for all you help.

I put the head back on with a new head gasket this morning. connected pipes back up and filled with water. No leaks which is great. I then connected all the other stuff and after about 30 minutes messing around with the static timing it fire up and purred! Still a few things more to do before I get in running to temp so I can torque the head again but progress has been made.
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Re: Head Gasket

Postby woodywoodchipper » Mon Jan 16, 2017 1:25 pm

did you find out what was wrong???????????????????
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