1098 head gasket

[daveyl]

Does anyone know about this? When I place a head gasket over the block surface, obviously the bore is round, yet the gasket holes are oliptical and overhang the bore. Particularly between 2 and 3 bore.

I assumed the steel (crush??) rings around the inner diam. of the of the gasket holes were meant to be 'sandwiched' between the block and head.

[bmcecosse]

Your gasket is correct - just make sure all the studs are firmly in the block - everything is spotlessly clean, and a thin smear of grease on both sides of the gasket..... Torque it to 44 ft lbf. Retorque after the first heat cycle - and then don't forget to reset the valve gaps.

[chrisryder]

the gasket shouldn't 'overhang the bore', if by which you mean that the gasket is covering up the bores.

the holes in the gasket should be eliptical (more like a tear drop really) and bigger than the bore, not covering it at all.

[MarkyB]

How does it look resting on the head?
There shouldn't be any overhang and it isn't supposed To follow the line of the bore exactly.

[bmcecosse]

It's slightly wider than the bore -I assume that's what you mean by 'overhang' .... ???

[daveyl]

If I place the gasket on top of the block, it 'overhangs' the bore (if the piston was at tdc it would make contact).

When I place it on the head, the combustion chambers are within the gasket holes.

However, I have ommited to mention that it is a +30 bore and the gasket overhangs all four bores, BUT it is more prominant either side of the middle bores. Not just a bit, approx. 2mm either side. Way out of reach of the 'crush rings'.

[linearaudio]

Doesn't sound right at all! +30 oversize should make no difference. The only block with smaller bores than the 1098/998, which it may be intended for is the 848/948cc A-series. What make is it? No way the fire rings, or any portion of head gasket, should infinge upon the bore!

[bmcecosse]

You sure you don't have a 1275 engine there????????? Does the block have removable cam follower covers?? Otherwise - there's NO CHANCE of a 1098 gasket overhanging into the bore - that won't last 2 minutes!

[daveyl]

Oh my, I wish this thread would go away now! Yes it is a 1275. I switched it from one corner of the basement to the other, several months ago where my 1098 now lives. This is the 2nd time in a week or so but, Doh!! Yes indeed, no cam follower covers. It has 12v as a s/n number. It's even painted in 'Ital' red.

I only re-checked the block when I measured the head gasket holes at 68(ish)mm. mmmhh I thought, More than plenty! And then saw the 12v staring at me.

I don't do this for your amusement or irritation. Promise.

[bmcecosse]

Oh dear......