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I have stock 1989 mercruiser 454 mag w/ thunderbolt 4
I have stock 1989 mercruiser 454 mag w/ thunderbolt 4 ignition. Setting total timing. TB 5 ignitions require grounding of "ignition system timing lead" This locks module into Base timing mode? I've lo… read more
Jason
Jason
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Vocational, Technical or Trade School
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When replacing batteries on my boat I sparked one of the
when replacing batteries on my boat I sparked one of the batteries and now the boat won't start. Its not getting fuel, I sprayed starting fluid in and it fired but didn't keep running. … read more
Jason
Jason
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I have a SeaRay Sundancer 290 with twin Mercruiser Sterndrives.
I have a SeaRay Sundancer 290 with twin Mercruiser Sterndrives. Under the dash there are two one-inch circular alarms which are Mercruiser engine alarms as indicated on a tag attached to the alarm wir… read more
Jason
Jason
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Hi there I have just bought my first boat (so I am inexperienced)
Hi there I have just bought my first boat (so I am inexperienced) & picked it up yesterday (Glastron(NNN) NNN-NNNN & I have been looking for the main engine circuit breaker before I go out to sea in i… read more
Tan
Tan
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where can I find a shop/service manuel for a 1985 30ft. Century
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Jason
Jason
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Vocational, Technical or Trade School
22,043 satisfied customers
Good Mornin from Denver (again) I dont know if my first
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Tan
Tan
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i am looking for a throttle body for a 1987 454 mercruiser
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Tan
Tan
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My nephew gave me a boat in lieu of a debt. It is a 1987 -88
My nephew gave me a boat in lieu of a debt. It is a 1987 -88 Mirage with a cabin and an inboard/outdrive. the outdrive is oem and is a mercruiser. The engine has been replaced and i am trying to figur… read more
Tan
Tan
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Hello, I own a 1989 Searay 268 with updates of engines/outdrives
Hello, I own a 1989 Searay 268 with updates of engines/outdrives etc in 2004. All equipment is in good condition with the repowered engines/outdrives etc only at 100 hours use, and now ready for their… read more
James
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jst bought twin 454,s was told boat had fiberglass fuel tanks
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Tan
Tan
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11,409 satisfied customers
I have two 454, 7.5 L gen 6 Merc cruiser engines . I was wondering
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Tan
Tan
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Dear Pro, Would like to find a solution as to what path shall
Dear Pro, Would like to find a solution as to what path shall I take in order to buy the correct and also the less expensive possible way to obtain used old boat parts. Therefore I´m really hoping you… read more
Jeff G.
Jeff G.
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I have an 88 SeaRay 268 Sundancer with a 7.4L 454 engine and
I have an 88 SeaRay 268 Sundancer with a 7.4L 454 engine and an Alpha outdrive. It's been running good but I started it up a week ago and there was a slapping sound, sorta like a playing card in bicyc… read more
Tan
Tan
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I HAVE A 1975 GLASTRON V174 BAYFLITE WITH A MERCRUISER 140
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was wondering where may get an owners manual which includes
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John White
John White
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I put new barr manifolds and risers on a pair of mercruisers
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I have a 1984 searay amberjack with a 454 mercruiser/borgwarner
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briggs archer
briggs archer
master marine mechanic
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I have a 1984 Merc 3.4 EFI and have a new set of T4 pistons
I have a 1984 Merc 3.4 EFI and have a new set of T4 pistons and rings. I've been told that the T4's were actually 3.9 liter motors? Would like to convert but need info on heads porting etc. Any ideas?… read more
Pappy's Sales and Service
Pappy's Sales and Service
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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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