45 replies to this topic

[craig 1010cc]

I've had teh HG blow between just the bores, it sounded just like the big ends had gone (fooled teh RAC guy).

[coopersmate]

I've had teh HG blow between just the bores, it sounded just like the big ends had gone (fooled teh RAC guy).

It is worth a check tonight, I guess a compression test will spot that for me, before I strip the head down

[jaydee]

I'm with Craig, check the head gasket.

[coopersmate]

I'm with Craig, check the head gasket.

So am I given the work involved between a head or crank shaft shell

[Stevie W]

Hi,

A blown head gasket between 2 cylinders can give a sound very like knocking big ends as craig 1010 said.
The "explosion" from the firing stroke of one cylinder can cause a sudden high pressure "wave" against the neighbouring piston and this shock can cause this kind of noise. It's a bit like very heavy pinking!
A compression check will immediately show if the is a break between two cylinders, so you'll get 2 good readings and then on the affected cylinder pair a poor reading on each of the cylinders.
If this is the case, continuing to run the engine like this will cause a "hot spot" between the cylinders in either/both the engine/block which can render both scrap!

Cheers,
Steve.

[coopersmate]

just done a compression test - cylinder one 190 psi, cylinder two 190 psi, cylinder three 30 psi, cylinder four 30 psi.
I think I've got a head gasket blown, time to strip the top half of the engine to see if I can get this sorted for London to Brighton!

[03jkirk]

good to hear that its not anything more serious and lets hope there no damage to the head or block between the cylinders

Edited by 03jkirk, 17 May 2012 - 07:11 PM.

[leroy26]

snap! im doing excatly the same sat!!
cyl 1 170,cyl 2 170, cyl 3 000, cyl 4 000

[coopersmate]

snap! im doing excatly the same sat!!
cyl 1 170,cyl 2 170, cyl 3 000, cyl 4 000

Are you aiming for London 2 brighton as well?

good to hear that its not anything more serious and lets hope there no damage to the head or block between the cylinders

looks alright but will contact a machine shop tomorrow and see if it can be decked, then i am thinking one of those black sticky gaskets, what are they called?

[03jkirk]

best stickin with a good quality copper head gasket

[jaydee]

Composite gaskets they're called.
You'll be fine even with the cheap gasket on a standard engine.
Just have the cylinder head skimmed a few thou, degrease the deck, and torque up the nuts in increasing settings, 30 then 40 then 50.

[sledgehammer]

sounds like fire rings burn't thru / leaking

suprised you didn't notice a loss in power / poor starting

glad to hear it probably wasn't the ends

[coopersmate]

Composite gaskets they're called.
You'll be fine even with the cheap gasket on a standard engine.
Just have the cylinder head skimmed a few thou, degrease the deck, and torque up the nuts in increasing settings, 30 then 40 then 50.

best stickin with a good quality copper head gasket

Thanks for the advice lads. I will proberbly get what I can get hold of as the work needs doing tonight. Then sheffield to crystal palace to run it in

sounds like fire rings burn't thru / leaking

suprised you didn't notice a loss in power / poor starting

glad to hear it probably wasn't the ends

car has been stood for 18 months and had trouble starting but that was battery and cold winters mainly. It did appear to just go. I am also very happy it wasn't the big ends

[coopersmate]

hi guys
just to update this. I have just changed the head gasket and the knocking is solved.

crystal palace tomorrow
come say hello
thanks for the help and support
ta
lloyd

[leroy26]

sweet ! ill crack on with mine then!