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Inlet / Suction valve cut

Posted: Wed Jul 11, 2012 3:51 am
by Pengze
Dear Sirs,
What are the causes for inlet / suction valves cut during operation for a medium speed diesel engine ?
Appreciate yr valuable feedback. Thks.

Re: Inlet / Suction valve cut

Posted: Wed Jul 11, 2012 10:24 am
by Big Pete
Sorry Pengze. i do not understand your question. Please elucidate.
BP

Re: Inlet / Suction valve cut

Posted: Wed Jul 11, 2012 10:47 am
by jimmys
Usually caused by poor valve rotators, and worn guides. Medium speeds are famous for this. The exhaust valve is removable in a pocket sometimes and the intake valve is never looked at. Water can be a problem in the air from intercoolers and can cut valves.

regards
jimmy

Re: Inlet / Suction valve cut

Posted: Wed Jul 11, 2012 7:49 pm
by Pengze
If the valve stem seals are defective, will this contribute to the suction / inlet valve cut / damage ?

Re: Inlet / Suction valve cut

Posted: Fri Jul 13, 2012 12:50 am
by jimmys
The stem seals control lubication to the valve stem and if they wear build ups of carbon due to over lubrication appear on the stem and the valve sticks and can seize in the guide. Sticky valves can off course contribute to cuts. Once the suction valve leaks and gas passes the stem seal there is no lubrication and a grey scum is seen in the valve area and contaminates the oil.

regards
jimmy