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valve job or complete overhaul?
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Topic author - Scurvy Dog
- Posts: 25
- Joined: July 30th, 2013, 9:27 pm
- Vessel Info: 1995 Carver 355 Aft Cabin
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valve job or complete overhaul?
- AaHubb
- Commander
- Posts: 315
- Joined: February 16th, 2013, 5:46 pm
- Vessel Info: '99 404 CPMY
my twin diesel pusher - Location: Kennewick, Wa
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Re: valve job or complete overhaul?
..Aaron
SeaDragon
- waybomb
- CYO Moderator
- Posts: 2483
- 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: 53 times
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Re: valve job or complete overhaul?
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
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- Scurvy Dog
- Posts: 6
- Joined: August 4th, 2013, 2:46 pm
- Vessel Info: 1995 Carver 355 Aft Cabin
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Re: valve job or complete overhaul?
All you need to run is 1) fuel 2) proper compression and 3) ignition source at the correct time. If you have that, and are still running bad you may have a tuning problem, partially clogged jet in carb ( dirty fuel injector if injected) or electrical problem killing spark.
I would check it over before considering repower at 400+ hrs.
Just my .02 cents
Iuka, Ms
1995 Carver 355 Aft Cabin
1987 Carver Santego 2767
1984 Bayliner Capri Cuddy
2005 Bass tracker 1850
- waybomb
- CYO Moderator
- Posts: 2483
- 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: 53 times
- Been thanked: 423 times
Re: valve job or complete overhaul?
Seriously speaking, a compression test is nice, but a leak down will be tell you much more, exactly. Not dependent on cranking power, carburetor, or anything other than valves and rings and headgaskets. Were all the plugs out and carb wot when doing the compression test? If the engine was cranking slowly, that test is useless and the numbers will be all over the place.
But I am betting your carbs need a teardown, clean, and reassemble.
And probably new plugs, wires, caps, and rotors. Fuel filter. Replace the antisiphon valves, and if you can pull and inspect the pickups at the same time, do it. Check fuel tank vents and clean them. All stuff you can do all by yourself.
I bet you'll be good to go.
As for slow cranking, load test the batteries, dissassemble all heavy battery connections and clean the terminals and the mounting surfaces. A slow cranking engine is an electrical problem usually.
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
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- Scurvy Dog
- Posts: 15
- Joined: June 5th, 2013, 4:51 pm
- Vessel Info: 1997 Carver 325 Aft Cabin
- Location: New Smyrna Beach, FL
Similar problem
I am thinking that if a repower is what I decide to do, perhaps I should do both of them given the fairly significant boat disassembly and labor issues to do one now and then be forced to do the other one in the future.
I would like to hear from you all with suggestions and thoughts about my choices here.
1997 Carver 325 Aft Cabin
Nightmare
- waybomb
- CYO Moderator
- Posts: 2483
- 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: 53 times
- Been thanked: 423 times
Re: valve job or complete overhaul?
While you have the plugs out, borrow a borescope and inspect the cylinders and valves.
I do not believe you have enough info to justify pulling the engines out yet. But that's just me - I hate doing too much work. I am lazy. I'd want to be certain the things needs replacement.
As for one or both, that's a financial decision and peace of mind decision. Just remember there are way too many marine mechanics that claim they can rebuild an engine. They probably can, but not correctly. It's more then sending stuff out for machining and bolting it together.
Me, I'd personally rebuild both. If I did not have the skills, I might chose to buy 1 <new> longblock. I would not buy a reman. My opinion; just what I would do.
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
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Topic author - Scurvy Dog
- Posts: 25
- Joined: July 30th, 2013, 9:27 pm
- Vessel Info: 1995 Carver 355 Aft Cabin
- Been thanked: 1 time
Re: valve job or complete overhaul?
- Lyndon670
- Admiral
- Posts: 657
- Joined: July 29th, 2013, 11:35 pm
- Vessel Info: 2000 Carver 506
Volvo TAMD74EDC - Location: Georgian Bay
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Re: valve job or complete overhaul?
A '95 with 480 hours? I just caught that.
Seriously speaking, a compression test is nice, but a leak down will be tell you much more, exactly. Not dependent on cranking power, carburetor, or anything other than valves and rings and headgaskets. Were all the plugs out and carb wot when doing the compression test? If the engine was cranking slowly, that test is useless and the numbers will be all over the place.
But I am betting your carbs need a teardown, clean, and reassemble.
And probably new plugs, wires, caps, and rotors. Fuel filter. Replace the antisiphon valves, and if you can pull and inspect the pickups at the same time, do it. Check fuel tank vents and clean them. All stuff you can do all by yourself.
I bet you'll be good to go.
As for slow cranking, load test the batteries, dissassemble all heavy battery connections and clean the terminals and the mounting surfaces. A slow cranking engine is an electrical problem usually
I have to totally agree with this opinion. A total of 480 hours is absolutely nothing. "Well" maintained gas engines (regardless of displacement) should have a lifespan of 2000hrs. During that 2000hrs, valve jobs would probably be requied at the 1000-1200hr mark, with carb rebuilds thrown in there as well. Oil changes, proper engine loading and RPM managment will help get you to the 2000hr mark. My '93 Silverton 41C with 8.1L Crusaders had 942hrs on her and it ran like a top. The new owner had a compression test, leakdown test and a bore scope check done as part of the survey. All came back well within the limits, or as quote in the engine analysis "like new". I changed the oil 2 times a season, impellers every other year, never warmed her up beyond the thermostats opening up, and only pushed her to WOT at the start of the season to make sure all was well from the winter. Other than that she ran at 3000rpm MAX wich was a fast cruise of 17kts.
You are best to have an engine surveyor give you advice, not the local marina mechanic, an automotive mechanic, or worse yet - your buddy who restores old Chevy's. Pay the $500 and have one of these experts give you the non biased opinion, then talk to your marina mechanic based on their information.
2000 Carver 506
FOXY JOE
Volvo 7.4TAMD
Queens Cove Marina
Georgian Bay, Ontario
- George D
- Scurvy Dog
- Posts: 3
- Joined: January 5th, 2018, 11:53 pm
- Vessel Info: 1985 aft cabin 32 foot twin mercruisers
- Location: Ensenada
Re: valve job or complete overhaul?
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