 | Home > Tdi > 300TDi crankshaft nose oil seal leak |
 
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| I Like Old Skool Member Since: 23 Feb 2015 Location: Manchester Posts: 860   
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Are you aware that replacing the crank oil seal involves removing the timing belt? Time for new belt and idler/tension pulleys plus setting up the timing.
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13th Jun 2025 3:37pm |
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| sako243 Member Since: 08 Jul 2014 Location: Wales Posts: 1247  
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There's an O ring in there as well which is more for sealing the oil. The seal stops crap going into the sump, the O ring helps stop the oil coming out.
Seating the seal can be a bit of a  but using two crank sprockets and the crank pulley bolt it can be driven in slowly and evenly. Ed
82 Hotspur Sandringham 6x6 95 Defender 110 300Tdi |
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13th Jun 2025 10:32pm |
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| I Like Old Skool Member Since: 23 Feb 2015 Location: Manchester Posts: 860
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Here's what I have recorded from the last time I did the timing belt in 2015 (now overdue again!).
Timing belt kit STC4096LG Timing Belt ERR1092 Genuine Dayco Tensioner LHP100860 Genuine INA Idler LHV100150 Genuine INA Crank Gear LHH100660 (with machined sides) Gasket ERR7293 ERR4576 outer cover dust seal ERR4575 - Inner crankshaft oil seal ERR4710 - O-Ring |
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14th Jun 2025 12:25am |
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| MercianRover Member Since: 07 Apr 2022 Location: Culworth Posts: 163 
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Yep, thank you  |
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17th Jun 2025 8:34am |
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| MercianRover Member Since: 07 Apr 2022 Location: Culworth Posts: 163
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Thank you, very useful! |
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17th Jun 2025 8:35am |
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| MercianRover Member Since: 07 Apr 2022 Location: Culworth Posts: 163
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Hello,
thanks for all the suggestions on this job. The genuine manual is quite sparse in some areas particularly regarding fitting oil seals. The primary reason for replacing the timing bell is because of a leak between inner oil seal and crank timing belt pulley. There was no obvious reason for this having just removed the old pulley and seal. The oil seal had the void facing the inside of the engine and the front face was flush with the front of the timing cover inner face. I suspected the O ring but that was in position between crank nose and old pulley, undamaged and with traces of vaseline remaining. Is this correct? Tricky to tell from the myriad videos on YouTube. Reason I ask is that there is a flange to prevent the seal being inserted too far. The pulley and seal relative position looks good but I don't want the "joy" of having to repeat this job in the near future. Thanks once again! |
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7th Aug 2025 2:24pm |
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