muss12 Posted October 2, 2013 Share Posted October 2, 2013 Well after changing my timing belt on my 300tdi 90 and taking 2 days to remove the crankshaft sprocket I managed to knacker the alloy casing up around the seal, so now I have replaced the rear casing and everything else and aload of new seals, I am still getting oil dripping from the bottom wadding hole in the case? I've took the everything out and back in 6 times now and thought that this time everything was good till driving it, it only appears after I've been driving and then stop that I see oil on the floor. What else can it be? I've replaced everything twice And must say I'm a master now at timing belts I've done that many bloody times Quote Link to comment Share on other sites More sharing options...
Tetsu0san Posted October 2, 2013 Share Posted October 2, 2013 if you take the timing chest cover off, can you see any oil in there? It could be coming from the cam or possibly even from between the chest and the block which in turn is leaking down inside the chest. I see you have replaced this chest, so when you did it did you replace the little rubber seal between the block and the chest? But if you take off the cover you should see where it is coming from. Quote Link to comment Share on other sites More sharing options...
muss12 Posted October 2, 2013 Author Share Posted October 2, 2013 You can see some oil when you remove the front timing cover at the bottom, as for rubber seal I only thought there was the gasket on the back of the rear cover I put the sprocket back on so careful and the seal so I didn't have to remove it again, but this has failed, I think its the crankshaft sprocket rear seal again but I don't why it keeps failing Quote Link to comment Share on other sites More sharing options...
Tetsu0san Posted October 2, 2013 Share Posted October 2, 2013 Just a thought, did you put that rear seal in the right way round? Quote Link to comment Share on other sites More sharing options...
Tetsu0san Posted October 2, 2013 Share Posted October 2, 2013 And if you only see the oil at the bottom then it has to be that crank seal that is leaking. You could always seal it in with some RTV I suppose, just in case? Quote Link to comment Share on other sites More sharing options...
muss12 Posted October 2, 2013 Author Share Posted October 2, 2013 That's what I mean I can't see why its failing everything went back the right way. And its only happening when its under pressure Do you think some RVT around the seal and case would stop the oil? Quote Link to comment Share on other sites More sharing options...
Tetsu0san Posted October 2, 2013 Share Posted October 2, 2013 When you say under pressure, is your engine breathing at all? If you run the engine is there smoke and pressure coming out of the dipstick and oil cap? My old 300Tdi was breathing heavily and that tends to try and push oil out of every place it can. I had a leaky rear crank seal, leaky breather, in fact leaky everywhere. if you engine is breathing badly then there may not be a lot you can do about it without trying to find out why it is breathing. That can be just a blocked breather or knackered bores, piston rings, head gasket etc etc. mine was bores, rings and just generally knackered. How many miles has it done (not that it means much, but it might be a good indicator)? Quote Link to comment Share on other sites More sharing options...
Tetsu0san Posted October 2, 2013 Share Posted October 2, 2013 But yes, RTV may help to seal the, er, seal. It shouldn't need it but in your case it is worth a try. And again, out of interest, is the hole where the seal is being sat OK? There is no damage to the surface where the seal touches the sides? Quote Link to comment Share on other sites More sharing options...
muss12 Posted October 2, 2013 Author Share Posted October 2, 2013 Well it doesn't leak when its not running so I thought if the engine is running must be some pressure there to be pushing it past the seals everytime. I'll have to check and see about the breathing in the morning check the oil cap and dipstick like you said Its a recon engine reading 65000 on the clock I was told the clock matched the engine Quote Link to comment Share on other sites More sharing options...
muss12 Posted October 2, 2013 Author Share Posted October 2, 2013 No the casing was all fine nice and smooth and the seal went in bloody well for a change last 3 on the old casing was a nightmare because of damage Quote Link to comment Share on other sites More sharing options...
Maverik Posted October 3, 2013 Share Posted October 3, 2013 Did you use a new sprocket? - if the sealing face on the sprocket is warn the oil might be leaking though. Mav Quote Link to comment Share on other sites More sharing options...
Rangy35 Posted October 3, 2013 Share Posted October 3, 2013 Is the seal at the correct depth so that the cam belt sprocket does not destroy it. Quote Link to comment Share on other sites More sharing options...
CwazyWabbit Posted October 3, 2013 Share Posted October 3, 2013 Silly question, did you fit the O-ring that goes behind the crankshaft timing belt gear when you changed the seal? Quote Link to comment Share on other sites More sharing options...
Maverik Posted October 3, 2013 Share Posted October 3, 2013 Silly question, did you fit the O-ring that goes behind the crankshaft timing belt gear when you changed the seal? Good point, took me a bit of thinking when I first did a 300tdi as to why it was needed, but its to stop the oil leaking past the keyway in the crankshaft... Quote Link to comment Share on other sites More sharing options...
muss12 Posted October 3, 2013 Author Share Posted October 3, 2013 Thanks for the replies, I fitted a new O ring that came with the kit all new sprocket as well, when I put the seal in I pressed it till it was flush with the casing? Is that the correct depth? Quote Link to comment Share on other sites More sharing options...
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