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Re: Oil pump scoring

I have read all the posts on this string and I am amazed that know body has asked the question. What sort of oil pressure was achieved before the strip down. Although I agree that once apart it is easy enough to do. What is wrong with the old adage. If it's not broke then don't fix it.

John Mason

Location: Nottinghamshire

Re: Oil pump scoring

John Mason
....What sort of oil pressure was achieved before the strip down. ........ What is wrong with the old adage. If it's not broke then don't fix it.
John Mason


I agree with your last point, John, but this was an engine that I bought 95% complete, so not running.

It's a bit of a long story, but it had been 'rebuilt' by somebody in the 1980s and left unfinished. Naively, I thought that all I had to do was fit the new Cambridge cylinder head that came with it, and make a few adjustments. I had looked inside the engine before buying it and although it was clear that its components had had some use, it was extremely clean and the block had modifications typical of the time. Unadjusted tappets - completely slackened off - should have given me some clues that there might be more to do.

Once completed, noises from the timing gears when turning it over on the handle led me to discover a tooth missing, this in turn led to realisation that there was no backlash in the timing gears and that there was a large amount of endfloat in the camshaft. With the engine partially stripped to take the camshaft out, curiosity led me to check the oil pump for wear, and hence this thread, which I didn't imagine would develop as it has (although it has included discussion about lathes and other workshop equipment).

Hope that makes it clearer

John

Re: Oil pump scoring

John Mims
Austin in the shed
If you get stuck John you can send it to me.I need to bore some out(I bore them 1/16" over size),1/32" extra offset.You need good vanes,not rusty and I fit new springs.


Thanks for the offer, Austin in the shed.

I'm going to combine 'impecunious expediency' and compromise by stripping my two dead engines and seeing which pump has the best looking body (if you know what I mean). The vanes aren't too bad and I'm sure I can clean them up as Dave suggested on an oil stone.

If I do get stuck, however, how would I get in touch? perhaps you could PM me an email or something.

Thanks again

John

Think that's it.

Re: Oil pump scoring

I don't think you can ever trust a 'rebuilt' but never run engine unless you really know who rebuilt it and trust them to have done it right. Am going through this with an engine (not Austin) at the moment and the only thing to do is strip it all down, clean, check and rebuild it yourself. If you're lucky you get to reuse most of the main parts and just need to replace gaskets and lock washers and so on. On mine there is so much gasket goop everywhere a total strip down is required. It also has that old problem of numbered big ends on the connecting rods but the numbers don't go in order! So who knows what state it is in.

As for lathes they are very handy. I have a little Chinese mini lathe at home and it works very well (with some fettling) for small things. At work I have access to three others, a mini lathe like mine, a medium one and a monster. Technically you can't use any without health and safety training so I am only allowed to use the medium one (same goes for the table saw, drop saw, etc, etc).

They call this training but it is nothing at all to do with how to safely use a lathe. This is more idiot, cover their asses legally training for the workplace. Thing like don't get long hair/clothes caught in the lathe. Don't trip over it. If you have to lift it don't strain your back (seriously!). If using coolant you have to wear full safety gear including respirators. We're also not allowed to use them after hours unless the company health and safety person is physically onsite!

Presumably they need someone there to do the paperwork in case of an accident?

Simon

Location: Wellington

Re: Oil pump scoring

It all sounds terribly dangerous Simon ;)

Re: Oil pump scoring

Simon Jansen
It also has that old problem of numbered big ends on the connecting rods but the numbers don't go in order! So who knows what state it is in.
Simon


I had that problem when my con-rods came back from being re-metalled. The company had carefully marked the pairs, but it didn't tally with the dot punches on the now clean metal that must have been done on some previous rebuild. As the con-rods had been line bored after re-metalling, I'm hoping all will be fine.