Engine rebuild

Post by **billlobban** » Tue Nov 03, 2009 9:46 am

Rebuilding spare 10V engine Main bearings do not have tab locking washers fitted is this correct?
Also bearing in mind the block is going off to the machine shop to be rebored is their any merit in fitting one of these modified rear oil seals.
Can I remove the tappet cover breather and fit it to the fuel pump blanking plate

Post by **Kevin** » Tue Nov 03, 2009 1:49 pm

Can I remove the tappet cover breather and fit it to the fuel pump blanking plate

Why

Post by **mike.perry** » Tue Nov 03, 2009 3:08 pm

I have a rear seal on my 1275 and I am not convinced that it makes any difference.
If anyone wants to give me a tin of Gunk for Christmas I can scrub my drive and garage floor

Post by **billlobban** » Tue Nov 03, 2009 4:34 pm

Kevin wrote:
Can I remove the tappet cover breather and fit it to the fuel pump blanking plate
Why

Cos I have read elsewhere that the breather on the tappet cover is hopeless and I thought that maybe having it fitted where the mechanical fuel pump goes might improve things

Post by **Jefftav** » Tue Nov 03, 2009 4:35 pm

Bill, if you do fit a rear seal oil kit speak to the machine shop doing your block as thes seals do rely on being fitted correctly and have fairly close tolerances. They are too expensive to just fit and hope for the best.

I have one at home if you want to see it and I am in Nethy Bridge on Friday so could maybe leave it somewhere for you to collect. Jeff

Post by **billlobban** » Tue Nov 03, 2009 4:38 pm

Thanks Jeff
Just let me know where you've left it and I'll collect. I'll return it to Inverness. Whilst on the subject of machine shops have you ever used the one in Alness?
Bill

Post by **bmcecosse** » Tue Nov 03, 2009 10:35 pm

I wouldn't bother with a rear seal - but it's your choice! Leave the cam follower breather where it is - why would it not work there ? Where have you read that it's useless ?? It works just fine! You can certainly add a breather to the fuel pump outlet - but I can't see the need for this! It is sometimes done on 'full race' 1275 Mini engines - and that's mostly because they don't have cam follower covers.

Post by **mike.perry** » Tue Nov 03, 2009 10:55 pm

The difference between the 1098 and 1275 engines is that the 1275s have very little clearance past the push rods. This can be seen when filling with engine oil, the 1098 rocker box drains a lot faster than the 1275. This also means that the crankcase pressure cannot escape into the tappet chest or rocker box as rapidly which is why it needs to be sucked out.

Post by **bmcecosse** » Tue Nov 03, 2009 10:58 pm

Ehh? It's exactly the same clearance twixt push rods and block!