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Running 5.0 on 7 cylinders

L

Longship

New member
Especially considering this is my first post.... Let the flaming begin. I understand what I propose is not a good idea.
1999 Mercruiser 305 220hp inboard with less than 500 hours. Powering a heavy Tollycraft 26. Plan or hope is to use the boat throught the summer, gather parts for diesel swap then a major swap this fall and winter.
The 5 liter broke a valve spring on #1 intake, this promptly and mildly bent the valve. Engine runs ok considering. I replaced the spring and pushrod in hopes I dodged a bullet. No luck, still no compression on #1.
What if I pulled the pushrod back out of #1 so the valve no longer moves and further damages the head. Then I run it for the season, when I say run it I mean trawler speeds no trying to plane or any on that.
Is this crazy? Will it ruin the engine beyond reasonable repair? I do have a "get home kicker" in case of utter failure.

Thank YOU!!!
 
Docksidemarineservices said:
It can ingest water if not firing on all 8. Pull the head and fix it. Not a difficult job to do.
Click to expand...
Another issue I hadn't thought about. Water ingestion due to lack of compression.
I think my question is answered. Something else I didnt consider is the raw gas running down the dead cylinder. Head job it is....
Thank you for the quick response.
 
Longship said:
Another issue I hadn't thought about. Water ingestion due to lack of compression.
I think my question is answered. Something else I didnt consider is the raw gas running down the dead cylinder. Head job it is....
Click to expand...
Wise decision....... and you may as well do both cylinder heads while at it.

NOTE: it's very important to remain with the same cylinder head casting #s should this one head need to be replaced.


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