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I'm looking to replace or rebuild two jabsco seawater pumps
I'm looking to replace or rebuild two jabsco seawater pumps on 1992 mercruiser 454's and would like to see the price for each. … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
18,811 satisfied customers
My cruiser was originally equipped with a naturally
My cruiser was originally equipped with a naturally aspirated (Carb) Mercruiser 454 and Bravo 1 outdrive. I purchased a used jet boat engine, also a Mercruiser 454 but with fuel injection. My question… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
18,811 satisfied customers
I just compression tested a 1995 crusader 454 xl on a boat
I just compression tested a 1995 crusader 454 xl on a boat that i am buying. Reading came in from 120 dry to 125 with the exception of # 5 cylinder that read 100PSI (the next lowest was # 3 at 115). T… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
18,811 satisfied customers
Can I use a transmission that is paired with a 350, 454
Can I use a transmission that is paired with a 350, for a 454 motor? The transmission is : ZF Hurth 450-A2, 2.03:1 ratio. I'm about to purchase a boat from a guy who says he put the 454 in the boat fo… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
18,811 satisfied customers
I have a pair of 5.7's V8 Crusaders in a boat I just had
I have a pair of 5.7's V8 Crusaders in a boat I just had surveyed. Port engine was not running the same RPM as starboard on sea trial and compression test showed 160, 155, 135, 135 115, 140, 135, 135.… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
looking at buying a 2001 scout 155 boat w single Yamaha Outboard
looking at buying a 2001 scout 155 boat w single Yamaha Outboard 60TLRZ 2 stroke. Sales guy showed compression tests of 3 cylinders the same at 115. Is that good? Does it really mean anything? I under… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
I am thinking of buying a 1976 boat with cummins v504m engines.
I am thinking of buying a 1976 boat with cummins v504m engines. they only have 733 hours. Any proplems with them?… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
18,811 satisfied customers
I am currently looking to purchase a boat that has twin mecrucy
I am currently looking to purchase a boat that has twin mecrucy optimax 150hp engines. My concern is that they have 800 hours on them. What can you tell me about an engine with that many hours on it?… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
18,811 satisfied customers
I have a 1983 mercruiser 470 in line four. Checking compression
I have a 1983 mercruiser 470 in line four. Checking compression gives 110-115 psi on all four. Adding teaspoon of oil and retest made no difference. Do you think this is acceptable? Factory specs. are… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
My mechanic purchased Jasper engines and we have had no end
My mechanic purchased Jasper engines and we have had no end of problems with these 454 mercruiser shortblocks including rear main seal leaks, snapped rods and oil pan leaks. I want to know if others h… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,729 satisfied customers
I am negotiating for a 1995 Sea Ray with two 454 carburated
I am negotiating for a 1995 Sea Ray with two 454 carburated mercruisers, each with under 500 hours. What is the correct compression test number/s?… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
We are looking at a power boat with a 10 year old 115 Yamaha
We are looking at a power boat with a 10 year old 115 Yamaha motor. The compression check reads 115, 120, 110, 115. Of course there are no guarantees, but what is your opinion about this motor? Will i… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
18,811 satisfied customers
I am working on a 1987 Four Winns 160 Freedom with a 140 hp
I am working on a 1987 Four Winns 160 Freedom with a 140 hp 3.0. I have just replaced the camshaft and timing gears. the boat has not ran in two years. The trouble is it will not start. I am not getti… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
Im in the market for an older outboard to hang on my 36x14
I'm in the market for an older outboard to hang on my 36x14 houseboat. The marina where my boat is mored has an older evinrude for sale. The owner says it has a dead zone in the acceleration at approx… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,729 satisfied customers
Im looking at buying a 24 foot 2004 deckboat with a Mercruiser
I'm looking at buying a 24 foot 2004 deckboat with a Mercruiser 5.0 Bravo 3 that has 716 hours on it. The compression test results were as follows: 141, 149, 131, 135, 127, 149, 133, 137. The percenta… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,729 satisfied customers
are hurst boat transmissions any good looking at a welcraft
are hurst boat transmissions any good looking at a welcraft with 454 and 2 merc hurst trans… read more
Dominick
Dominick
Marine Mechanic
Vocational, Technical or Trade Scho
1,009 satisfied customers
I have twin 1993 OMC 5.8L Cobras EFIs. My STARBOARD engine
I have twin 1993 OMC 5.8L Cobras EFI's. My STARBOARD engine stall when I am docking. I have changed TSP and thermostat. The thermostat that was installed was a 140'. However the service manual said it… read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
2,672 satisfied customers
Just bought a 1985 boat with twin 7.4L Mercruiser inboards
Just bought a 1985 boat with twin 7.4L Mercruiser inboards (340HP). Did compression checks on all 16 cylinders, got readings from 115 - 125 psi on all cylinders but one (one cylinder was at 110psi). A… read more
Yachtwork
Yachtwork
Owner Team Yachtwork
Technical or Trade School
1,048 satisfied customers
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Meet the Experts:

Dominick

Dominick

Marine Mechanic

1,009 satisfied customers

25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified

Ted G.

Ted G.

Rigger, Diagnostician

704 satisfied customers

40 years boating, Safe boating instruct., Offshore Race promoter, Failure Analysis, Expert Witness

John White

John White

Marine Mechanic

306 satisfied customers

11 years experience working on outboards, inboards, sterndrives & pwcs

Jason

Jason

Marine Mechanic

18,811 satisfied customers

Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

MerCruiser Certified Technician

11,264 satisfied customers

40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.

Jeff G.

Jeff G.

Marine Mechanic

4,729 satisfied customers

42 years experience, Certified Master Technician, All Major Outboards, Sterndrives, Hi-Performance

Captain Dave

Captain Dave

Marine Mechanic

2,672 satisfied customers

USCG Licensed Captain, 20+ Years Boating, Fishing, Maintenance and Repair Experience

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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