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I am. I have a 3.0 mercruiser engine, it has an electronic
I have a 3.0 mercruiser engine, it has an electronic ignition (It's not est). I want to hot wire it on the ground to see if it runs ok? It has two wires out from the distributor, one black one red. I have the coil. Just want to make sure I connect it correctly to get it to fire. I do not have a harness on it. … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,804 satisfied customers
I have a question. I spoke to earlier, on running a 3.0
I have a question. I spoke to Jason earlier, on running a 3.0 mercruiser on the ground hot wired. The coil I have states on the side that an external resistor is required. will that be necessary? and … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,804 satisfied customers
Tan, I have a 1998 4.3l Vortec Mercrusier motor in my boat
Hi Tan, I have a 1998 4.3l Vortec Mercrusier motor in my boat that was dead on purchase. I have a replacement Volvo Penta that is like 2004 ish in great condition thats going back in the same place. I… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
I recently re powered my 2000 SeaRay. Replaced in kind with
I recently re powered my 2000 SeaRay. Replaced in kind with new long block 5.7 gm mercrusier. Used same electronic system. all is running well. Since the re power my tachometer in reading aprox. 400 t… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,804 satisfied customers
I have a 1985 Mercruiser 3.0L, 140HP. Its been running great
I have a 1985 Mercruiser 3.0L, 140HP. It's been running great for many years, including last year. I had it winterized at the local marina as I always do. This year, it started up fine in the driveway… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
22,804 satisfied customers
mercrusier 3.7 1987. tach runs eractic after 3000 rpms. Replaced
mercrusier 3.7 1987. tach runs eractic after 3000 rpms. Replaced with new tach,same results. I replaced the points and had the alternator rebuilt since the last time the engine was ran and the tach wa… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
I have a 1970 Larson 20 inboard.The engine is a Chevy 6 cyl.I
I have a 1970 Larson 20' inboard.The engine is a Chevy 6 cyl.I can't find the firing order on the block. Also I changed out the ignition module ,new rotor and plugs and now while trying to start it ac… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
good morning I need help. Ive owned this 1975 bowrider w/75
good morning I need help. I've owned this 1975 bowrider w/75 hp 3cyl for 6 yrs.Had no problems for 4.5 yrs.Last yr late it began to stutter at any speed beyond idle. Seemed to me to be a fuel problem.… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
Mercrusier 350 Magnum MPI I have a 2008 mercrusier 350 magnum
I have a 2008 mercrusier 350 magnum mpi with 300 hp. The serial number is XXXXX and the block casting number is XXXXX I would like to know what the head casting numbers are on this engine and do I hav… read more
Joe
Joe
Owner Kingsland Auto & Marine Services
Vocational, Technical or Trade Scho
1,396 satisfied customers
i have a 307 chevy in board marinised by volvo,but changed
i have a 307 chevy in board marinised by volvo,but changed to electronic ignition dizzys.what do i set the timming to,please help… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
what type of engine oil is used for a 1991 - 3.0 liter - 4
what type of engine oil is used for a 1991 - 3.0 liter - 4 cylinder mercrusier and what is the capacity?… read more
Whitecap36
Whitecap36
Service Manager/Technician
Vocational, Technical or Trade Scho
1,557 satisfied customers
I have a 5 liter inboard mercrusier. The motor will fire but
I have a 5 liter inboard mercrusier. The motor will fire but will not stay running. It gets fuel and will fire right away. Will not run… read more
K. Kergan
K. Kergan
Inboard/Outboard Mechanic
Vocational, Technical or Trade Scho
1,031 satisfied customers
put thermastat an water pump on a 75 mercrusier an moter still
put thermastat an water pump on a 75 mercrusier an moter still gets hot the moter is a six cylinder gm… read more
capt ron 1959
capt ron 1959
Owner/Marine Mechanic
Vocational, Technical or Trade Scho
348 satisfied customers
I have a shift problem with a mercrusier outdrive.I t shifts
I have a shift problem with a mercrusier outdrive.I t shifts fine when the engine is not running but sticks in gear when the engine is running. I changed both cables and the lower unit but it still st… read more
gearheadII
gearheadII
Bachelor's Degree
138 satisfied customers
i have a 88 sunbird boat that had a 4.3 omc motor in it with
i have a 88 sunbird boat that had a 4.3 omc motor in it with the omc cobra outdrive in it, the block cracked on th motor so i bought a 90's mercrusier motor for it, will the mercrusier motor work with… read more
Larry B.
Larry B.
Marine Service Tech
High School or GED
574 satisfied customers
I have a in-line 6 cyliner chevy,in a boat with electronic
I have a in-line 6 cyliner chevy,in a boat with electronic distributer.I'm looking to find out how to wire it up,and what gauge of wire to use.A web site or wiring schematic would be great. tks… read more
Dominick
Dominick
Marine Mechanic
Vocational, Technical or Trade Scho
1,009 satisfied customers
I have a 1975 23 thunderbird with a 351 engine and a mercrusier
I have a 1975 23' thunderbird with a 351 engine and a mercrusier outdrive, I put it in the shop to do some wiring repairs when I got the boat back the shifter would not go into gear, foward or reverse… read more
Yachtwork
Yachtwork
Owner Team Yachtwork
Technical or Trade School
2,302 satisfied customers
I have a 1975 searay with a ford 302 and a mercrusier ...
I have a 1975 searay with a ford 302 and a mercrusier outdrive my boat is overheating when it is underway. I have replaced the waterpump in the lower unit and the water pump on the engine along with t… read more
Scott
Scott
Marine technician
Vocational, Technical or Trade Scho
543 satisfied customers
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Meet the Experts:

Ted G.

Ted G.

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

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Jason

Jason

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Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

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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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