SRM Oil pump

[A10 Ray]

Hi all,
          just something to be aware of,  I fitted the srm oil pump and turned the engine over but not started it,
all seemed ok I removed the pump  and found some score marks on inner pump surface ( gasket ) the pump gasket surface is larger than the original pump the marks
were caused by the cranksharft gear,
 i removed the gear and  20thou ground off the gear surface refitted and now all good..
           As i said just something to be aware of.
         Regards Ray.

[berger]

i really don't know what has happened there, i have fitted two srm pumps and haven't had to take 20 thou off the timing gear

[muskrat]

G'day Ray.
Something amiss there. Are you sure the gear was pushed all the way home?
No problem with the SRM pump on my plunger.
If it is all the way home the only other way the gear could be out too far is the main bush thrust surface is worn or too thin. In which case you'd need a very thick shim under the drive bearing to compensate.
Cheers

[Radlan2]

I had something like this with the Hepolite pump, from memory there is a washer between the gear and the drive worm for the pump which in my case was likely a non original part, it had an outboard chamfer but was too thick causing it to rub against the pump body, it is all pretty close down there. This could potentially prevent the gasket sealing giving oil pressure/scavenge problems. Just a thought.
            Chris Prov

[A10 Ray]

Hi all,
          The score marks were very light barely touching but there, if i hadn't taken the pump off wouldnt have known.
                cheers Ray

[Swarfcut]

 Reading the original post for about the 6th time to get my head round this! My reckoning is that the pump itself  was too close to the face of the crank gear, in other words the nose of the pump was touching the gear which has had to have material ground off its front face to clear.

 So Musky's thought is one cause, crank too far towards the timing side. Too thin a pump gasket or a quality issue with the pump where too much has been ground off the backside moving the ensemble closer to the primary gear are another couple of reasons. Probably a case of all contributing and this is what we get.

 A timely reminder to check as you go, and don't think that all is as it should be, even from established suppliers.

 Swarfy.

[limeyrob]

This is a big issue with old Land Rovers, parts quality is very variable, from very good to terrible and there is no pattern to it, paying more doesn't guarantee better.  You have to assume the worst and measure and fettle everything as you go.  It doubles the work but there's no option.

[chaterlea25]

Hi All,
I have fitted several SRM pumps without issues, A new worm drive nut comes with them,
On the most recent build there was a light gouge on the crankcase very near the pump outlet i milled the case face flat where the pump sits, taking 10-15 thou off
A second gasket restored the clearance to the drive ..
The pumps will move about on the studs a little so make sure the drive gears are not binding, or too far away from each other

John

[sean]

Only problem I had with installing the SRM pump was an air lock …. Tipped the motor forward on the stand and it cleared …..easier to prime with a wrench than kicking it over if its a new build.

[Colsbeeza]

limeyrob, In the case of the SRM oil pumps, mine was of very high quality as I think they all are, so I don't think the pump is the issue.
Col

[chaterlea25]

Hi All,
Once the oil pump is fitted I use a pressure oil can to pump oil from the crankcase inlet through to the PRV chamber,
Then I fit the PRV and continue pumping until I cannot force anymore oil into the engine.
I add oil to the tank and wait until it flows out at the engine end of the pipe before connecting it to the engine
At that stage I am as sure as I ca be that the crank and feed system is full of oil before I start the engine.
I'm too wrecked to be kicking or pushing the bike until oil is circulated 

John

[limeyrob]

I've recently ordered some parts from SRM and I agree, quality very good so far.  I'm currently setting up a std oil pump and been surprised by the distortion in the mazak body.