anthonym Posted August 8, 2022 Share Posted August 8, 2022 https://www.dropbox.com/s/ncv8jyggdkjpwsu/WhatsApp%20Video%202022-08-08%20at%209.07.26%20AM.mp4?dl=0 video 8mb 39 seconds - leak from scavenger pump (fear the third bolt practically impossible to get at, or maybe the union of the oil line in to the block which I just resealed the block side of it but not the pipe side)this is after tightening a vast number of loose connections post 800 miles post rebuild. And it's worse than before I fixed it all, so that's why I suspect the union. I will be visiting the car shortly.anthony Link to comment Share on other sites More sharing options...
anthonym Posted August 8, 2022 Author Share Posted August 8, 2022 this is the union I suspect Link to comment Share on other sites More sharing options...
anthonym Posted August 8, 2022 Author Share Posted August 8, 2022 Tests, the sump is "loose" all the way round Link to comment Share on other sites More sharing options...
SM25T Posted August 8, 2022 Share Posted August 8, 2022 That might explain a lot Link to comment Share on other sites More sharing options...
anthonym Posted August 8, 2022 Author Share Posted August 8, 2022 Yes has improved matters. Now I need to know the hex size of the scavenge pump bolts. 5.5 mm seems to fit but I think it's not metric Link to comment Share on other sites More sharing options...
SM25T Posted August 8, 2022 Share Posted August 8, 2022 Then it will be an imperial size that fits ! Have you got a set of Allen keys or hex bits ? Link to comment Share on other sites More sharing options...
anthonym Posted August 8, 2022 Author Share Posted August 8, 2022 both - but none fit because of the space restriction, I have to cut allen keys Link to comment Share on other sites More sharing options...
SM25T Posted August 8, 2022 Share Posted August 8, 2022 5.5 maybe 7/32" ? Link to comment Share on other sites More sharing options...
anthonym Posted August 8, 2022 Author Share Posted August 8, 2022 yes I think so - was hoping someone might know for sure. It's a lot of cutting if only to find it's not 7/32 Link to comment Share on other sites More sharing options...
anthonym Posted August 8, 2022 Author Share Posted August 8, 2022 Having now been under the car staring at the offending area and examining all round the scavenge pump I am thinking it may be as simple as the (very old) sump gasket has had its day. We tightened it earlier and the amount of oil on the floor after a few moments is a fraction, say 20% of what it was before tightening. So I could try tightening again, but sump gasket replacements never used to be rocket science. Question is what does one use these days? Maybe that's a different thread so I'll ask separately here: https://www.caterhamlotus7.club/forum/techtalk/what-sump-gasket-not-cork-i-supposeI spoke with Titan and it became apparent that to get access to the three connecting head bolts, it may help to removed the outer sections of the pump by removing the 4 bolts in the outer cover plate. Stag Weldseal will be required for refit. This will make space to fit tools in to the three hex bolts, especially the impossible number three (upper left as looked at). Just that right now I think the sump is more suspect than the pump.Anthony Link to comment Share on other sites More sharing options...
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