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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
11,409 satisfied customers
I have a 4.3L mercruiser in a 1992 Bayliner. It runs very
I have a 4.3L mercruiser in a 1992 Bayliner. It runs very rough with black smoke on startup. Runs fine when warm. Spark plugs have black sooty deposits on them, not oiled. It has new everything but th… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,804 satisfied customers
1996 Sea Ray Sundancer -- 7.4l efi mercruiser engines. I am
1996 Sea Ray Sundancer -- 7.4l efi mercruiser engines. I am considering buying the boat and would appreciate an independent answer for my question below. Compression test results port: 1-145lbs, 2-140… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,804 satisfied customers
1997 jet ski 900 zxi exhaust water supply broke . it over heated
1997 jet ski 900 zxi exhaust water supply broke . it over heated replaced head gasket and other exhaust hoses . new compression only at 85 psi will start with fuel sprayed in carbs but will not keep r… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
Hi I have a mercruiser 5litre v8. the problem is that when
Hi I have a mercruiser 5litre v8. the problem is that when cranking it over she will not fire?, have removed the carb and cleaned, have cheched for spark all ok when i look into the top of the carb i … read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
what is accepablerange for a compression test on a 2002 Mecury
what is accepablerange for a compression test on a 2002 Mecury 225 hp EFI outboard engine and what is the acceptable max variance % range between all cylinders to show that engine is is good to excell… read more
Noel Schembri
Noel Schembri
Marine Mechanic
Diploma
2,759 satisfied customers
I need a blue book value for my boat. I have a 1996 Chaparral
I need a blue book value for my boat. I have a 1996 Chaparral 2130 sport SS. It has a 7.4L Mercruiser,Bravo3 dual prop(stainless steel),extended hull for quick planning. It has a small tear in the int… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,804 satisfied customers
Have a 1990 7.4L Mercruiser. Misses and backfires thru the
Have a 1990 7.4L Mercruiser. Misses and backfires thru the carb at 3200-3800 RPM. Fouls the #8 plug. New cap, rotor, plugs, ignition module, plug wires, and carb overhauled. Looked at rocker arms, pus… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
Good morning sir I see no post response for my message please
Good morning sir I see no post response for my message please do so at your earliest convenience regards… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
I have a boat inboard engine 1978 470 mercruiser. It was left
I have a boat inboard engine 1978 470 mercruiser. It was left out in the rain all winter.when we tried to start it woudn,t catch .tried running live wire directly to coil ,it smoked! replaced it and p… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
Trying to find out the best mercruiser diesel engines to re
Trying to find out the best mercruiser diesel engines to re power a 38 foot Chris craft Catalina Boat. (replacing the 7.4L pump gas mercruiser engines, 340hp ea..) Currently bolted up to Borg warner b… read more
Noel Schembri
Noel Schembri
Marine Mechanic
Diploma
2,759 satisfied customers
I have a mercruiser 1982 260 hp I/O (chev 350), the carb kept
I have a mercruiser 1982 260 hp I/O (chev 350), the carb kept loading up, dumping gas in the manifold and flooding out, like maybe the pressure was too high. I installed a new marine fuel pump (quicks… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
I Have 1979 Johnson Motor 35 horse power when i put it in
I Have 1979 Johnson Motor 35 horse power when i put it in the water it barely pulls but when out of water i have plenty power… read more
Whitecap36
Whitecap36
Service Manager/Technician
Vocational, Technical or Trade Scho
1,557 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
4,730 satisfied customers
I am looking at purhasing a 1987 Carver 32 Mariner with 2
I am looking at purhasing a 1987 Carver 32' Mariner with 2 Mercruiser (GM 5.7 Gen 1-E) motors. I have asked for the motor cyliners to be pressure tested. What pressures should I be looking for to ensu… read more
Captain Dave
Captain Dave
Charter Captain & I.S. Director
Master's Degree
2,808 satisfied customers
I have 1989 Larson Hampton I just bought a couple weeks ago.
I have 1989 Larson Hampton I just bought a couple weeks ago. It ran great yesterday, but today was sluggish, overheated and stopped running. Cannot get it to restart. Engine cranks, but will not turn … read more
Master Tech
Master Tech
Service Manager/Technician
Vocational, Technical or Trade Scho
1,167 satisfied customers
I had a mechanic at my marina today tell me that I have no
I had a mechanic at my marina today tell me that I have no compression in cylinder 6 and "erratic" compression in cylinder 2. He is recommending a long block replacement since he does not know the who… read more
Joe
Joe
Owner Kingsland Auto & Marine Services
Vocational, Technical or Trade Scho
1,396 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
2,577 satisfied customers
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Ted G.

Ted G.

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Jason

Jason

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Tan

Tan

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

Jeff G.

Jeff G.

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Noel Schembri

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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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