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Forum: Engines and Propulsion Systems

27-08-2017, 09:53

Replies: 21

Volvo penta Md7a reseating valves ,and replacing valve seals only 2? A few questions.

Views: 9,460

Posted By model 10

Re: Volvo penta Md7a reseating valves ,and replacing valve seals only 2? A few questi

Seals on the exh side are not always a good thing. You get more valve guide wear and the oil helps with cooling. I would not do this to an old engine design.

Forum: Engines and Propulsion Systems

26-08-2017, 18:00

Replies: 21

Volvo penta Md7a reseating valves ,and replacing valve seals only 2? A few questions.

Views: 9,460

Posted By model 10

Re: Volvo penta Md7a reseating valves ,and replacing valve seals only 2? A few questi

Installing a new valve seat is a big deal. Sorry to say, just lapping valve seats is a half ass deal. It is impossible to get a proper fit by lapping. Valves and seats are ground at different...

Forum: Engines and Propulsion Systems

26-08-2017, 12:35

Replies: 21

Volvo penta Md7a reseating valves ,and replacing valve seals only 2? A few questions.

Views: 9,460

Posted By model 10

Re: Volvo penta Md7a reseating valves ,and replacing valve seals only 2? A few questi

You only need a seal on the intake valve. It keeps the oil leak into the engine to a min. The exh goes the other way, so no big deal.
The only test you can do with your valve lapping job, is pour a...

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