Forum

[Barnes]

Hi all. Having had my freinds 62 interceptor mk1 rebored to +20 i have brought new crossrings for it from our hosts at the same size but when i torque down the head to 20ft/lbs as stated in the manual the rings are nipping the pistons slightly. The pistons will go past but there is a definate nip there can anyone tell me where i am going wrong. I have used 2 paper gaskets under the barrels. My thoughts are to raise the barrels slightly with another gasket to stop the nipping. But is this the way to go? Thanks ed

[Mark M]

Ed, you need +20 Cross Rings to go with the rebore. Simples!
REgards, Mark

[Barnes]

Hi mark. I have got +20 crossrings. They arrived yesterday but this problem persists....

[PeteF]

Torquing the head down shouldn't make any difference. Surely the tight spot is there without the head on as well? Did you gap the rings correctly?

[Barnes]

Hi pete. Yes rings are all gapped. The tightspot is bang on TDC the piston is definatly nipping the crossring. Ed

[Mark M]

Ed, if the rings are from our Hosts get them to check a set and send you some more. The new ones are not made to the original process and can be a little variable in my experience! I thought this problem had been solved but someone on the Inter Group had the same difficulty a little while ago (as I did on my Mk1). I managed to get a genuine NOS set for my Mk2 through contacts. It is also possible that if the heads have been skimmed clearances might be over tight, there is a compression plate available as well, as fitted to late Mk1s and subsequent models.
REgards, Mark

[Norm]

Barnes I had exactly the same problem back in November with a 1A Inter I ended up using slightly thicker gasket material, went gasket, compression plate, gasket. Can't remember how thick the compression plate was buy it was very thin probably about 10 thou

[Barnes]

Hi all. Thanks for your replies. I believe the barrels have been skimmed in the past. I have added 1 extra paper gasket under the barrels and its now fine. I think also the heada have been skimmed as the spark plugs are also touching the piston crown. Only way i can see around this is to insert a thicker compression washer. Thanks ed