Recently became the victim of a stuck inlet valve on the port engine, much to my surprise. It has turned out to be gummed up sticky inlet valves after tearing it down. Upon closer inspection the K&N Intake filters on both engines have a similar ( more than you'd like to see ) amount of oil deposit in the lower cowling of the filter base. Both engines got a rebuild some years ago and have always been strong engines. I've never noted any crankcase breathing at all, but it must be their to get the oil into the filters...?
Last summer the boat went through 3000ltrs fuel and ran fualtlessy on 3 week coastal trip, returned to the boat some 4 days later started it up and straight away it sounded off. Compression test told me zero on cylinder 2.
I find it strange that both engines have oil in the intakes, since rebuild the boat has clocked 600 hrs over 8 years. hours are monitored by port engine which runs a lot more than starboard to charge batteries and give hot water when not on berth as river based. So roughly the Starboard engine has probably ran no more than 400hrs after a rebore and full head overhaul. I could see the port engine possibly glazing up and giving this problem but both engines at the same time???
Im using Oil recommended to me - Quicksilver mineral 25W40, last oil change I added Lucas heavy duty oil stabiliser... Im wondering if this is the culprit with the already thick oil??
So doing some more research I've found that the recommended oil for a 1994 SBC is 10W-30??? not sure if thats mineral or synthetic as yet, can anyone confirm the favourite tipple apart from Gas...
Both engines are 1994 pre Vortec engines on 4bbl carbs.
Has anyone come across a similar problem and found a solution?? any thoughts / help appreciated
Last summer the boat went through 3000ltrs fuel and ran fualtlessy on 3 week coastal trip, returned to the boat some 4 days later started it up and straight away it sounded off. Compression test told me zero on cylinder 2.
I find it strange that both engines have oil in the intakes, since rebuild the boat has clocked 600 hrs over 8 years. hours are monitored by port engine which runs a lot more than starboard to charge batteries and give hot water when not on berth as river based. So roughly the Starboard engine has probably ran no more than 400hrs after a rebore and full head overhaul. I could see the port engine possibly glazing up and giving this problem but both engines at the same time???
Im using Oil recommended to me - Quicksilver mineral 25W40, last oil change I added Lucas heavy duty oil stabiliser... Im wondering if this is the culprit with the already thick oil??
So doing some more research I've found that the recommended oil for a 1994 SBC is 10W-30??? not sure if thats mineral or synthetic as yet, can anyone confirm the favourite tipple apart from Gas...
Both engines are 1994 pre Vortec engines on 4bbl carbs.
Has anyone come across a similar problem and found a solution?? any thoughts / help appreciated