B-PEE

All things general in here
RightyO
Posts: 153
Joined: 23 Oct 2012, 19:14

Re: B-PEE

Postby RightyO » 18 Nov 2018, 20:04

Thanks for the offer Darren but i think it may have a crack in the cylinder wall ,It seems strange that when Nick first had the boat it had a crack in a cylinder which makes me think that the exhaust setup may let some water up and the thing has had a hydraulic effect ,with the head gasket blown out between 6 and 8 and 3 cylinder destroyed .I will have to strip the block out and take it in to see if it is definitely cracked and can be sleeved .
Ken

Waywood
Posts: 37
Joined: 20 Jan 2014, 11:32

Re: B-PEE

Postby Waywood » 22 Nov 2018, 19:56

Hi Ken. Definitely go over everything on that motor. Timing marks may possibly be out. Maybe the dizzy faulty,maybe lean?? At most of the events before and after the build it never ran well. Matt(former boat person)

Will
Posts: 71
Joined: 21 Nov 2015, 14:04

Re: B-PEE

Postby Will » 23 Nov 2018, 07:12

Hi Ken - I think you are on the right track with the hydraulic effect, that piston / gasket failure has all the signs of a previous hydraulic issue
The ring land crack looks mostly old with just a few spots keeping it in place until the last workout.
Could be a cracked cylinder wall was the initial culprit because you need a lot of water in the cylinder to apply high pressure to the cylinder wall
More likely just enough water to exceed the combustion chamber volume then at almost TDC very high hydraulic load on piston / gasket
just my 2 bobs worth - good luck with it

RightyO
Posts: 153
Joined: 23 Oct 2012, 19:14

Re: B-PEE

Postby RightyO » 05 Jan 2019, 20:18

B Pee is back together ,i think the past problems have been solved .I kept asking myself how can water be getting into the cylinders and have discovered that if i set the marine manifolds at the same angle as the engine which is a unusual setup and connect the garden hose to the water outlet pipe a percentage of the water runs back down the manifold ,this would not matter if the engine was running but if you were to wind the engine over with out it starting the pump will push water down the manifolds . I have fitted the over head pipes now and hope it has solved the problem .Boats only seem to cause trouble when you add water .
Ken

RightyO
Posts: 153
Joined: 23 Oct 2012, 19:14

Re: B-PEE

Postby RightyO » 06 Jan 2019, 17:27

I have added a couple off pictures ,one of the engine angle in the boat and a second with the manifold set up as it would be in the boat .A few extra inches of 1/2” stainless tube may have saved a couple of engine rebuilds.

ken 1.jpeg
ken 1.jpeg (1.69 MiB) Viewed 62 times


ken 2.jpeg
ken 2.jpeg (1.62 MiB) Viewed 62 times
Last edited by Greg on 07 Jan 2019, 06:18, edited 1 time in total.
Reason: Pictures reoriented

RightyO
Posts: 153
Joined: 23 Oct 2012, 19:14

Re: B-PEE

Postby RightyO » 06 Jan 2019, 17:48

photo's upside down again ,no comments please.

Doc
Posts: 234
Joined: 18 Jul 2009, 07:28

Re: B-PEE

Postby Doc » 06 Jan 2019, 19:38

Your manifold might have a fault from new , when these manifolds are poured , entry points each end of manifold at the same time, hot alloy runs to the centre. If it cools down flowing she might not bond as one at the centre. This creates a fault line and when started expands opposite centre exhaust ports and fills pots with water. Pressurised manifold off the motor with a hose and block off exit.
Doc.


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