<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Roger,<div><br></div><div>As far as I know there are two versions of the rear main seal conversion. However, going back 20 years there may have been other version. One type is the red square and the other is the round unpainted type. The retaining spring is removed from the seal and then the seal is cut through so it can fit around the crankshaft then the retaining spring is fitted. The cut in the seal is at 12 o’clock. Quite possibly both versions use the same seal.</div><div><br></div><div>Remove the old seal out and take BC Bearing/Motion Industries, they should be able to match. It would suggest sealing the holder for the seal to the block with RTV when reassembling.</div><div><br></div><div>I will send some pictures.<br><br><div dir="ltr">Harold Manifold</div><div dir="ltr"><br><blockquote type="cite">On Jun 7, 2023, at 9:41 AM, Roger Grace <roggrace@telus.net> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><div dir="ltr"><div>I would really appreciate hearing from people with experience doing this task.</div><div>BJ8 with clutch and flywheel removed.</div><div>Engine has had the rear main oil seal conversion done some time ago. Now leaking badly. Objective is to replace the lip seal. Am assuming it was a Moss one. It looks similar - is there a way to positively identify the source of the original conversion kit ?</div><div>Were there other kits available around, say 20 years ago ?</div><div><br></div><div>So have loosened the 4 x cap screws that secure the upper and lower housing to the back plate. The housing is now loose. Struggling to remove the cap screws. Their heads seem too big to come out the flywheel bolt holes ? Need to move housing forward so then can loosen the screws that secure the top and lower housings together.<br></div><div>Next move would be to move crankshaft a few degrees to give more clearance - nervous screws may drop into a bad location !</div><div>So ideas/thoughts please ?</div><div>Moss have a replacement lip seal that will order and will assume will fit as doubt that there are many variations.</div><div>Thank you</div><div>rg<br></div><div><br></div><div><br></div><div><br></div><div><br></div></div><div id="DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2"><br><table style="border-top:1px solid #d3d4de"><tbody><tr><td style="width:55px;padding-top:13px"><a href="http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail" target="_blank"><img src="https://s-install.avcdn.net/ipm/preview/icons/icon-envelope-tick-green-avg-v1.png" alt="" width="46" height="29" style="width: 46px; height: 29px;" data-unique-identifier=""></a></td><td style="width:470px;padding-top:12px;color:#41424e;font-size:13px;font-family:Arial,Helvetica,sans-serif;line-height:18px">Virus-free.<a href="http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail" target="_blank" style="color:#4453ea">www.avg.com</a></td></tr></tbody></table><a href="#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2" width="1" height="1"></a></div>
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