N Blandin Posted May 4, 2012 Share Posted May 4, 2012 Had a call from a friend today, he's working on a K R500 that pumps oil out the rear main seal at about 5000 rpm. Oil pressure on the Stack is 60 psi on ticker and up to 78 psi at 6000rpm. The breathers on the cam cover are blanks. You can see the oil returning to the tank, there is a little crankcase pressure with the oil cap off the cam cover, but not much. No smoking or rattles and it drives fine. Any ideas? Link to comment Share on other sites More sharing options...
Stationary M25 Traveller Posted May 4, 2012 Share Posted May 4, 2012 Assume that 60psi on tickover is on first start up, not when hot ?? Seen front seal pop out on a local Seven - turned out to be overfilled I think ? Link to comment Share on other sites More sharing options...
Leadership Team SLR No.77 Posted May 4, 2012 Leadership Team Share Posted May 4, 2012 It sounds suspiciously like the scavenge pump is tired and not keeping up at higher revs? Been there done that ..... and stuffed a couple of big end bearings! Also check the scavenge pickup filter is not blocked? The oil pressure pump will create a positive pressure in the block, the scavenge pump will create a negative - as long as the scavenge pump is doing a better job than the pressure pump it gives the usual slight negative pressure that exists in a dry sump setup. Stu. Link to comment Share on other sites More sharing options...
N Blandin Posted May 4, 2012 Author Share Posted May 4, 2012 Sorry, rubbish description at the top! It really pumps out a fair bit in the bell housing when running. The tank has enough oil but not too much. The motor was rebuilt recently too. The guy found the leak and replaced the rear main seal. It's still doing it though! So, if the scavenge pump is goosed, the build up of positive pressure increases with revs forcing the oil out the easiest exit, which is the largest seal. Works for me! Thanks Link to comment Share on other sites More sharing options...
johnv Posted May 5, 2012 Share Posted May 5, 2012 I too have a seemingly untraceable oil leak .. and this talk of scavenge pump and big end bearings has got me worried! How does one check for a knackered scavenge pump? Link to comment Share on other sites More sharing options...
Racingshoe Posted May 5, 2012 Share Posted May 5, 2012 Not sure how you check if the pump is goosed, but Titan have a very good refurb service. They turned mine around quite quickly last year. Link to comment Share on other sites More sharing options...
Englishmaninwales Posted May 5, 2012 Share Posted May 5, 2012 How much? Link to comment Share on other sites More sharing options...
Leadership Team SLR No.77 Posted May 5, 2012 Leadership Team Share Posted May 5, 2012 IIRC it's around £65 for them to strip it and check it over, I think about £90 if it just needs a general service. Mine came to £130 because it needed a new shaft and cover plate - still waiting for it because Titan are waiting for a batch of shafts. Stu. Link to comment Share on other sites More sharing options...
Area Representative Nick Chan Posted May 5, 2012 Area Representative Share Posted May 5, 2012 TC's is over there too waiting for refurb. I suspect the body needs replacement 😳 but even this fairly substantial item they suggested was only £80. I suspect this charge is in addition to the normal service charge which doesn't sound too bad at all Nick Edited by - Nick Chan on 5 May 2012 13:07:40 Link to comment Share on other sites More sharing options...
Leadership Team SLR No.77 Posted May 5, 2012 Leadership Team Share Posted May 5, 2012 I think the end plate for mine is only about £6, the shaft is £30. Stu. Link to comment Share on other sites More sharing options...
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