clymer dominator workshop manual re oil pump

Previously Phil Hannam wrote:

Check attachments for details.

Thanks Phil, I had already seen this from your earlier advice on the forum showing pump refurb in RH 237. I note that my '57 pump has the same cog arrangement as the Commando one, that is the larger cogs at the drive side. Would that be the right pump for my 88? Engine is rebored with n.o.s hepolites and valve guides. My problem is excessive smoking, on second stripdown pools of oil were on top of the pistons! All else in order, however fitted n.o.s. rings and rehoned bores double checked all clearances and reassembled, checked pump again all ok. Still smokes.

Thanks guys for the prompt replies.

Regards,Roger

Previously Phil Hannam wrote:

The Dominator oil pump internals changed with the introduction of the 650 and Atlas engines. Consequently, there are two pumps which will suit the range of bikes falling roughly into pre-1962 and 1962 onward categories. Those from 1962 onwards had wider gears to increase the output and scavenging volumes. A little later 6 start worm and drive gears were added to increase the flow levels even more.

These extra attachments have more info regarding types and dimensions.

Thank you Phil I can now ID my pump-great info.

Thanks again

Previously Gordon Johnston wrote:

It sounds like too much oil is getting to the top end. You can check circulation of the oil pump fairly simply by just looking in the oil tank with the engine running. If you get an intermittent stream of returning oil, at least your scavenge side is working fine. An engine after a rebore is likely to be a bit smoky until the rings bed in. How many miles since the rebore? You may have to consider a restricter in the feed to the rockers. If you have a later high output pump fitted, you may be over-oiling, though I have fitted one to an otherwise standard 88 with no problems.

Thanks for this, I used to do rebores and this problem is far in excess of just a running in issue. After identifying the pump I shall move onto the rocker feed possibility.

Thanks to all replies for their input and interest-great forum.

Roger