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| P5m suspect head gasket & oil seal fa... |
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James Gabriel
New member
Username: 1942jamesg
Post Number: 1
Registered: 08-2008
| | Posted on Monday, August 11, 2008 - 05:40 am: | 
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I removed the starter motor from our P5m to rectify a sticking Bendix drive.I found it covered with the classic mixture of oil and water i.e mayonnaise.I fixed the starter and the engine runs well but I suspect a failed head gasket and a failed rear crankshaft oil seal.Worse.it could be a cracked block.We have only just bought the boat and do not know how well it was laid up last winter.Any help would be appreciated. |
Giles Stuart
New member
Username: ragged_robin
Post Number: 2
Registered: 07-2008
| | Posted on Thursday, August 21, 2008 - 03:42 pm: |
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James,
It might have been possible for water to have got in through the drive outlet seal if there was water in the bilge of the boat. I should try changing the oil, although I have found that sometimes you have to do this more than once to get rid of any water present. It hardly takes any water to emulsify the oil even condensation can cause this. The Mini car engines were prone to this and BMC tried all sorts of breathers to stop the oil emulsifying! |
James Gabriel
New member
Username: 1942jamesg
Post Number: 2
Registered: 08-2008
| | Posted on Sunday, August 24, 2008 - 03:56 am: |
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Giles
Many thanks for your input.Our engine is a two stroke and its lubrication is only contained in the fuel.It has no sump with oil in it as the crankcase is part of the compression cycle.Bilge water has never reached the seals because that would have immersed the flywheel first and made an almighty mess as soon as we started the engine.The gearbox does contain oil but there is no emulsion in there,which is why I suspect a head gasket or a cracked block.The purpose of the rear crankshaft oil seal is to keep the compression in the crankcase so that it can be transferred to the cylinder.Would you agree with this or do you have any other ideas? Again many thanks James Gabriel |
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