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Forum: General Q & A

04-11-2016, 06:48 AM

Replies: 44

454 compression test question

Views: 34,627

Posted By deputydog

The motors are gen IV with a casting number of...

The motors are gen IV with a casting number of 14015445. The cooling system is open and the boat has always been on the great lakes. One issue I see is the last owner stored the boat in heated indoor...

Forum: General Q & A

04-11-2016, 02:44 AM

Replies: 44

454 compression test question

Views: 34,627

Posted By deputydog

I agree on everyone about the numbers and some...

I agree on everyone about the numbers and some versions being closer to 150 and others closer 130...heck my 67 pontiac has 13to1 comp motor and cranks at 240psi with big roller cam. I'm just confused...

Forum: General Q & A

04-10-2016, 05:16 PM

Replies: 44

454 compression test question

Views: 34,627

Posted By deputydog

Almost forgot....I think they are 454 340hp...

Almost forgot....I think they are 454 340hp mercs....I'll have search difference between the 330hp I thought it was and the 340hp they are.

Forum: General Q & A

04-10-2016, 04:46 PM

Replies: 44

454 compression test question

Views: 34,627

Posted By deputydog

Thanks for all the input so far.... no receipts...

Thanks for all the input so far.... no receipts for manifolds but saw notes in a log book for rust on the manifolds and a receipt for riser gaskets. Sucks buying boat knowing it needs works..... if...

Forum: General Q & A

04-10-2016, 12:24 PM

Replies: 44

454 compression test question

Views: 34,627

Posted By deputydog

Well...just did the leakdown....all the cylinders...

Well...just did the leakdown....all the cylinders at 125psi were at 20%...all 4 cylinders at 95psi were at 70% and the air was escaping through the carb...meaning intake valves.

Hopefully just...

Forum: General Q & A

04-09-2016, 09:56 PM

Replies: 44

454 compression test question

Views: 34,627

Posted By deputydog

Never thought of that but good point. Yes...

Never thought of that but good point.

Yes I'm looking to buy.... have deposit just being thorough on inspection before sea trial.....I will do the leakdown and redo then low cylinders tomorrow...

Forum: General Q & A

04-09-2016, 09:02 PM

Replies: 44

454 compression test question

Views: 34,627

Posted By deputydog

The batteries were fully charged and all the...

The batteries were fully charged and all the plugs were out but the throttle blades were closed. Going back tomorrow with a leakdown tester and will try with a throttles open... seems very strange...

Forum: General Q & A

04-09-2016, 03:57 PM

Replies: 44

454 compression test question

Views: 34,627

Posted By deputydog

454 compression test question

The question is for a 38 foot Bertram motor yacht I put a deposit on.... its no performance boat but would like opinion from the engine gurus.

The boat was repowered in 1997 and the 454 330hp...

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