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Engine Replacement
- waybomb
- CYO Moderator
- Posts: 2534
- Joined: February 5th, 2013, 9:24 pm
- Vessel Info: 1995 Boston Whaler Rage15
1987 3697 Carver Mariner
1988 Cougar 46 Kevlar Vee offshore
1969 15' Glasspar / 1967 Johnson Electromatic 85 - Location: Saint Joseph,Mi
- Has thanked: 56 times
- Been thanked: 444 times
Re: Engine Replacement
Fred
1969 Glaspar Avalon /1967 Johnson Electromatic 85
1987 Carver Mariner
1988 Cougar Kevlar 46' with triple blown 572 ci
1995 Boston Whaler Rage
Past - 1988 2807, 1989 4207 Aft
-
- CYO Supporter
- Posts: 6031
- Joined: July 10th, 2015, 9:58 pm
- Vessel Info: 1989 Carver 3807 Aft Cabin
- Location: Ontario, Canada
- Has thanked: 457 times
- Been thanked: 1690 times
Re: Engine Replacement
A couple of questions:
Is there a lot of blue smoke when you first start her up after sitting overnight and then it subsides?
Does the blue smoke continue for as long as you run the engine or just at startup?
Is there blue smoke regardless whether it's at 800 or 2000 RPM?
Are you noticing a performance issue; rough idle, etc,?
Most important; have you had an oil change recently, was the proper grade oil used, AND is your engine oil at the proper lever?
As for the number of hours, while they're a starting point, the only thing it tells you is how long the ignition system has been energized. On older engines some of that could be from just leaving the ignition key in the ON/RUN position. Do that when you leave to go home for the week and you've added over 100 hours. What's more important is how the engine was run and maintained in the past. A very high hour engine that was well maintained and not overworked will be in best condition than a low hour engine that's been neglected and abused. The above tests with the addition of a vacuum test (if you can still find someone who knows how to interpret it) will tell you more about the engine's condition than the hour meter will.
I wouldn't repower the boat with lower horse power engines.
Is this a fresh or salt water boat? Has she ever been in salt water? You should add your location to your personal info, it helps.
- waybomb
- CYO Moderator
- Posts: 2534
- Joined: February 5th, 2013, 9:24 pm
- Vessel Info: 1995 Boston Whaler Rage15
1987 3697 Carver Mariner
1988 Cougar 46 Kevlar Vee offshore
1969 15' Glasspar / 1967 Johnson Electromatic 85 - Location: Saint Joseph,Mi
- Has thanked: 56 times
- Been thanked: 444 times
Re: Engine Replacement
I haven't done it in a boat, but did on many car engines back in the day. It's not hard at all.
Fred
1969 Glaspar Avalon /1967 Johnson Electromatic 85
1987 Carver Mariner
1988 Cougar Kevlar 46' with triple blown 572 ci
1995 Boston Whaler Rage
Past - 1988 2807, 1989 4207 Aft
- bud37
- Admiral
- Posts: 4931
- Joined: April 23rd, 2015, 10:22 pm
- Has thanked: 585 times
- Been thanked: 1229 times
Re: Engine Replacement
Let's see what the compression tests bring, I agree with the leak down, that would be my choice of diagnosis.
The pcv valve check is good as a bad one can cause pressure issues, they are cheap enough , but it is important to get the right one for the engine.

- Cooler
- Admiral
- Posts: 1659
- Joined: May 22nd, 2018, 12:09 pm
- Vessel Info: 1995 Carver 330 Mariner
Twin 350XL Crusaders
Home port: Menominee, MI - Location: Green Bay, WI
- Has thanked: 68 times
- Been thanked: 399 times
Re: Engine Replacement

( All weather people have to say this on air, near lakes )
- Capt Happy
- Deck Hand
- Posts: 65
- Joined: May 17th, 2015, 4:55 am
- Vessel Info: 1974 16 Foot ex DFO Lapstrake Speedboat
1985 21 Foot Baby Cape Islander
1977 26 Foot Trojan F-26 Cruiser
1997 Carver 320 Voyager - Has thanked: 29 times
- Been thanked: 13 times
Re: Engine Replacement
The blue smoke is worse at startup and dissipates somewhat during operation, although it never completely goes away. Engine rpm does not seem to make it worse, but remains present during all variations of speed.
I always check the levels of fluids before running. We have been using the recommended oil for these engines and change at least once a season. Our current usage averages about 50+ hrs per year.
There have been some instances of rpm deviations with the st'bd engines as noted on the sync gauge, coupled with rough performance. This might last a few minutes and then correct itself for hours. Never seems to act up when mechanic onboard of course. This seems to be more prevalent at higher rpms.
Another item to add, is the engines are fuel injected, I may have mislabeled them, my bad.
We have maintained the engine's to the best of our ability and they are hardly ever pushed beyond 2100, except in rare cases other than to clean things out for a few minutes.
We will do all the suggested tests and report back as soon as it bloody warms up here a bit. Once again, thanks to all the great members of this forum. It is very nice to be able to request information from many knowledge folks.
Cheers, Capt Happy
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