Tricky-Ricky Posted April 27, 2007 Share Posted April 27, 2007 Update on PRV spring/s just received my oil seal and springs, yes there are two despite only one being listed on the EPC and manual. 0.37 liters per second:( If thats the worst case scenario, then even a 1/4 of that is going to fill and pressurize the small gallery between pump rear and seal pretty quickly. Here is a pic of the front of the pump, not very good but you get the idea, what is not visible is the area behind the seal, i will post a pic of this when i remove my seal later. http://www.imagestation.com/picture/sraid225/pc33ec937616b4b1e765a5e2c23786f04/e9bf8e6e.jpg Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted April 27, 2007 Author Share Posted April 27, 2007 Can you post detailed high definition pics of the rotor face on the alloy front part of the pump casing please? same for front face of rotors? They will show how much wear scoring there is. Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted April 27, 2007 Share Posted April 27, 2007 Not my pump Chris, just a pic i had stored from my last seal problem. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted April 27, 2007 Author Share Posted April 27, 2007 Anyone got internal pics of a pump that spat its front seal?? Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted April 27, 2007 Share Posted April 27, 2007 OK seal pics for dandan. all i found was that the spring was off as expected. http://www.imagestation.com/picture/sraid225/pbc6862616a4eb6e5ff919744565ca824/e9bf01c5.jpg http://www.imagestation.com/picture/sraid225/p2a13be63c59807b2e054d3955805f7ba/e9bf0152.jpg Quote Link to comment Share on other sites More sharing options...
Digsy Posted April 27, 2007 Share Posted April 27, 2007 Same as Chris' one then. Apart from that it looks fine. I think its pretty odd that the spring should suddenly decide to pop out of its housing. Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted April 27, 2007 Share Posted April 27, 2007 Same as Chris' one then. Apart from that it looks fine. I think its pretty odd that the spring should suddenly decide to pop out of its housing. Not if the seal has been overcome with pressure, as the lip gets displaced, seal looks absolutely fine, and no wear on crankshaft. Quote Link to comment Share on other sites More sharing options...
Mike_Mac Posted April 28, 2007 Share Posted April 28, 2007 Just to butt in with a bit of history on this particular car that Chris is talking about which might be relevant (it's mine by the way ). 4 months ago it had a crankshaft pulley damper fitted. This was after the old one had separated into two pieces (I found the outer ring of the damper lying on the undertray by chance when I was tracking down a rattle in the Cat heat-shield). The belt was running on what was left of the damper and there was no indication when driving that anything was wrong. I don't have any technical knowledge of this subject, other than what's in this thread, but is it possible that the disturbance of the outer ring falling off and the belt then pulling what's left of the damper has disturbed either the seal or the retaining spring because of uncancelled vibration in the shaft? Probably irrelevent, but it just gives a bit more background that might be useful. Quote Link to comment Share on other sites More sharing options...
Digsy Posted April 28, 2007 Share Posted April 28, 2007 Mike, good info, but I don't think that would have had any effect on the seal spring. Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted April 28, 2007 Share Posted April 28, 2007 Well fitted my new seal and put it all back together today, also changed the oil back to 5W 30, haven't had a chance to drive it yet as my bloody back is bad:( hopefully tomorrow, going to be a little hesitant for a bit but i still need to set my boost up, i am also going to attach my peak hold boost gauge via tube to the dip stick tube just to see if and what pressure/vacume i get, just out of interest, although i am 98% sure its oil pressure related, if the dam thing goes again, i think i'll pay someone to take out the oil pump and check it and open out the drain hole, i have also made an inquiry at a local bearing suppler as to whether there is an uprated version of the seal that will handle more pressure before letting go. Quote Link to comment Share on other sites More sharing options...
Lee P Posted April 28, 2007 Share Posted April 28, 2007 Anyone got internal pics of a pump that spat its front seal?? My pump after seal problems. Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted April 29, 2007 Share Posted April 29, 2007 A bit unclear but it looks pretty scored, what sort of miles had the engine done? and was there any oil contamination? Quote Link to comment Share on other sites More sharing options...
JohnA Posted April 29, 2007 Share Posted April 29, 2007 Very interesting thread. The FMS issue is still open. Several theories, both here and on Supraforums, no definite answer yet. I'd wonder, has the seal gone south in an engine with demonstrably low blowby? (something we know positively, not just 'it didnt smoke so I guess it was OK') Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted April 29, 2007 Author Share Posted April 29, 2007 Yes, Mikes car has no discernible crankcase pressurisation. less tahn 1 PSI hot or cold, under full boost. Stock ventialtion system in place. Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted April 29, 2007 Share Posted April 29, 2007 Very interesting thread. The FMS issue is still open. Several theories, both here and on Supraforums, no definite answer yet. I'd wonder, has the seal gone south in an engine with demonstrably low blowby? (something we know positively, not just 'it didnt smoke so I guess it was OK') Will let you know when i get to drive mine, back is stll fooked:( Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted April 30, 2007 Share Posted April 30, 2007 OK finally got to drive the Supra today, didn't push it, about 0.95 bar and probably no more that 5500 RPM, and the seal is holding, its high RPM that i'm concerned about as this is where oil pressure is at the highest. I also did a test on the any crank case pressure with a peak hold boost gauge, and the result was 0 maybe slight vac, but no problems, so i guess that categorically rules out any pressure problems on my engine. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted April 30, 2007 Author Share Posted April 30, 2007 I gave Mikes car a good hard run from cold, full boost for ages, against the brakes, up a hill, and up to the rev limiter, several times, with no problems. He also got back from here to Devon (I think it was Devon) with no issues. So for now a new seal has fixed things. There was no more end float than well within spec, so it's not a crank end float issue, either. Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted April 30, 2007 Share Posted April 30, 2007 Chris, did you happen to get any oil pressure readings? and out of interest what oil grade was it using? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted April 30, 2007 Author Share Posted April 30, 2007 90 psi from cold at 6000 revs. 10/40 fully synthetic Quote Link to comment Share on other sites More sharing options...
Kev.O Posted April 30, 2007 Share Posted April 30, 2007 My front crank seal went, and now that I have a replacement pump someone is welcome to my pump for examination if they wish. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted April 30, 2007 Author Share Posted April 30, 2007 My front crank seal went, and now that I have a replacement pump someone is welcome to my pump for examination if they wish. Yes please! Has it been apart yet? Any other engine problems on this pump? Thanks Kev. Quote Link to comment Share on other sites More sharing options...
absz Posted April 30, 2007 Share Posted April 30, 2007 i also have a pump not been stripped has covered 45k miles. removed last week due to full engine rebuild. if anyone needs it for tests. Quote Link to comment Share on other sites More sharing options...
Kev.O Posted April 30, 2007 Share Posted April 30, 2007 Yes please! Has it been apart yet? Any other engine problems on this pump? Thanks Kev. This is the pump from the engine we spoke about today Chris. Looks like oil starvation on the engine. I can either post it to you or pop it up when I pick the other stuff up from you. No it hasn't been apart. Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted April 30, 2007 Share Posted April 30, 2007 90 psi from cold at 6000 revs. 10/40 fully synthetic I get 117 PSI at idle from cold on 5W 30, Christ knows what it would be at 6,000 RPM:( although hopefully the PRV would be active well before then, i would still like to find out at what pressure it should start to open? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted May 1, 2007 Author Share Posted May 1, 2007 I get 117 PSI at idle from cold on 5W 30, Christ knows what it would be at 6,000 RPM:( although hopefully the PRV would be active well before then, i would still like to find out at what pressure it should start to open? Load on PRV springs at full closed in pounds times surface area of PRV piston orifice in square inches. Quote Link to comment Share on other sites More sharing options...
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