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Engine Replacement

GAS engine, transmission and generator repair and maintenance discussion forum.
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Topic author Canada
Capt Happy
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Posts: 64
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: 25 times
Been thanked: 13 times

Engine Replacement

Postby Capt Happy » March 21st, 2025, 2:15 pm

Good Day All,

Has anyone re powered a 320 Voyager ?

We have the 350 Crusader XL's with a little over 1100hrs on each. Started to burn some oil towards the end of last season and maybe this is related to a simpler issue that does not require for them to build rebuilt. We will have to look further into this. It is only the st'bd one that we are having trouble with currently, just thinking about be proactive and if we have to haul one, we might as well do both. I'm basically just the driver and leave the mechanics for someone else.

My question, is there another smaller engine setup that will match with the engine mounts and transmission ?
We don't run the engine's that hard and therefore if there is a more efficient power option out there, we might be inclined to explore that option.

Hope everyone is having a great day and would like to thank all in advance for any replies.

Cheers Capt Happy

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Canada
bud37
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Re: Engine Replacement

Postby bud37 » March 21st, 2025, 2:26 pm

Yup get that checked out first.....compression test em both to get a baseline and go from there.

The thing that ya always have to remember, one day you will want to sell that boat and how it is repowered will affect the sale.

Good luck with it, hope it is something easy.
FWIW.....The above is just my opinion..... :popcorn:
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United States of America
waybomb
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Posts: 2531
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
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Re: Engine Replacement

Postby waybomb » March 21st, 2025, 2:48 pm

It still takes x amount of horsepower to move the boat.
Like bud37 says, one day you'll sell the boat. Nobody wants a butchered boat.
Thanks
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
User avatar

Topic author Canada
Capt Happy
Deck Hand
Deck Hand
Posts: 64
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: 25 times
Been thanked: 13 times

Re: Engine Replacement

Postby Capt Happy » March 21st, 2025, 2:57 pm

I agree with both of the above comments, was just throwing darts out there to see where they would land. If it was a viable option , we may have looked into.

We have had the boat quite a few years and intend to keep a few more.

Is 1100hrs alot on a gas engine ? To rebuild both engines is probably going to take the shine off of 15-18k. We have no issues with this, but are the members out there thinking that this might be too early for replacement ?
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United States of America
waybomb
CYO Moderator
CYO Moderator
Posts: 2531
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: 441 times

Re: Engine Replacement

Postby waybomb » March 21st, 2025, 3:02 pm

If you took care of them, I'd guess 2000 hours would mean replacement time.
Viper will chime in on real world experience.
But before of all this worst case scenario, do a leak down test. Do you see blue smoke, or is it more of a losing oil somewhere, somehow thing?
Thanks
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
User avatar

Topic author Canada
Capt Happy
Deck Hand
Deck Hand
Posts: 64
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: 25 times
Been thanked: 13 times

Re: Engine Replacement

Postby Capt Happy » March 21st, 2025, 3:06 pm

Thank you for taking the time to respond.

Yes, we are starting to see blue smoke and a very light oil sheen at idle while dockside.
User avatar

United States of America
waybomb
CYO Moderator
CYO Moderator
Posts: 2531
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: 441 times

Re: Engine Replacement

Postby waybomb » March 21st, 2025, 3:14 pm

Not a good sign.
I'd be doing a leakdown test.
Thanks
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
User avatar

Topic author Canada
Capt Happy
Deck Hand
Deck Hand
Posts: 64
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: 25 times
Been thanked: 13 times

Re: Engine Replacement

Postby Capt Happy » March 21st, 2025, 3:57 pm

Thank you Capt,

We will keep the community advised as to where things go from here.

Cheers
User avatar

United States of America
waybomb
CYO Moderator
CYO Moderator
Posts: 2531
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: 441 times

Re: Engine Replacement

Postby waybomb » March 21st, 2025, 4:06 pm

Does that engine have an open crankcase or did it have a pcv system?
Thanks
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
User avatar

Topic author Canada
Capt Happy
Deck Hand
Deck Hand
Posts: 64
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: 25 times
Been thanked: 13 times

Re: Engine Replacement

Postby Capt Happy » March 21st, 2025, 4:44 pm

Hi Fred,

They have positive crankcase ventilation.

I keep the bilges as clean as possible and do not see any residual oil laying below the engine's anywhere.

I can't speak exactly as to how the previous owner kept the engines up, but based on the condition of the rest of the vessel, he would have been on top of things for sure.

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