daveturnbull Posted June 8, 2022 Share Posted June 8, 2022 So after replacing the timing belt and front crank seal, this happened. On further investigation it seems the crank sprocket is a very tight fit on the new seal, and is tearing it apart. It fits the old seal nicely. Sprocket is the later updated one with the lipped edges, seal that went was a genuine ERR4575G, the old seal that came out was black in colour and has no part number on it. There is obviously a small difference in the ID size of the seals, but only a few thou. Has anyone experienced issues with the sprocket not fitting inside the front crank seal properly? There doesn't seem to be any other part number for a 300tdi front crank seal, but I need some bits that fit together to fix this. Another thought, does anybody have a spare sprocket they could accurately measure the OD of the seal face so I can compare it to mine? 1 Quote Link to comment Share on other sites More sharing options...
Snagger Posted June 8, 2022 Share Posted June 8, 2022 At least you know the source of that oil and how to fix it. Can’t help with dimensions, but I’m sure Frida Turner would help. Quote Link to comment Share on other sites More sharing options...
Maverik Posted June 9, 2022 Share Posted June 9, 2022 I've got a box of old 300tdi sprockets I can go measure, let me go have my breakfast and I'll go do it. Quote Link to comment Share on other sites More sharing options...
Maverik Posted June 9, 2022 Share Posted June 9, 2022 Top is non genuine Middle is genuine LR Bottom is non genuine (britpart I suspect) 1 Quote Link to comment Share on other sites More sharing options...
daveturnbull Posted June 9, 2022 Author Share Posted June 9, 2022 Thanks, I'll get that checked against mine. 1 Quote Link to comment Share on other sites More sharing options...
hurbie Posted June 11, 2022 Share Posted June 11, 2022 problem may be there's not enough chamfer on the end of the sprocket. on mounting you wil push the lip off the seal inwards, and cause a leak. might be worth investigating. Quote Link to comment Share on other sites More sharing options...
steve b Posted June 11, 2022 Share Posted June 11, 2022 It could well be the genuine seal is wrong . I attempted to fit a genuine rear main seal to a 300 last year and it was about 1.5mm too big !!! The seal expander ring was irrelevant , probably could have thrown it on from other side of workshop. A quick chat with Frida at Turners and it turns out JLR are aware of the issue but have not withdrawn the stock ... The Turners supplied one fits very well and is nothing like the JLR one in design. Steve Quote Link to comment Share on other sites More sharing options...
daveturnbull Posted June 11, 2022 Author Share Posted June 11, 2022 Well it's all back together now with another genuine seal very carefully pressed into place. About 15miles in and it's not leaked yet, I'm keeping a close eye on it tho. The seals are a very tight fit, much more so than the diff pinion seal I did recently. Quote Link to comment Share on other sites More sharing options...
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