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Dominick, Marine Mechanic
Category: Boat
Satisfied Customers: 1009
Experience:  25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified
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I got a 27ft silverton wihh a 454 marine power. v drive trans.

Customer Question

i got a 27ft silverton wihh a 454 marine power. v drive trans. right hand rotation. the problum is i cannot get over 3000 rpm. a wot. replaced the carb,dist, fuel pump,coil spark plugs. fuel filter. tryed runing it suckikng out of a 5gal can, did a comp check 145-150 on all cyl.has about 800 hrs on motor. got any ideas what could be the problume.bottom is clean
Submitted: 2 years ago.
Category: Boat
Expert:  Jason replied 2 years ago.
Hello my name is ***** ***** am I speaking with? Have you checked fuel pressure with the boat at it's top speed? Also, have you checked to make sure ignition timing is advancing?
Customer: replied 2 years ago.
yes. fuel press is 7psi. new dist. checked@ 3000rpm it is 30deg
Expert:  Jason replied 2 years ago.
When was the last time the engine made full power? Have you ever seen it make full power personally/ What kind of story can you tell me on this?
Customer: replied 2 years ago.
two months ago i could get 4100 rpms i always ran it about 3800 rpms better fuel ecomney. this problmen just started a few weeks ago
Expert:  Jason replied 2 years ago.
Does it run any better or differently with the engine cover open?
Customer: replied 2 years ago.
no tryed all that
Customer: replied 2 years ago.
(Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Expert:  Jason replied 2 years ago.
When you pulled the plugs out, did any of them come out overly clean or with white inner insulators?Have you tried doing a cylinder drop test?
Expert:  Jason replied 2 years ago.
The website does offer phone calls but it is an additional service at an additional fee. I'm actually on my way out to go out to dinner so I wouldn't be able to do it until I got back. Did you want the phone call or did you prefer to stay online?
Customer: replied 2 years ago.
no the plugs looked good. did not do a drop test

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