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I have 1990 Silverton 34C with 454 crusader engines many…

I have 1990 Silverton 34C...
I have 1990 Silverton 34C with 454 crusader engines many years of great boating
A problem this year is the starboard engine will not go over 2,000 RPM when running
in gear. At the dock it will rev to 4,000+ no problem.
I have changed fuel filters, plugs, rotor ,and cap Had the timing check on the curve
Switch carbs on engines ,changed fuel pump on problem engine and switch fuel pickup
hoses. Is there a governor on the trany.to stop the engine from going over 2,000
It is a BorgWarner 1-1.5. I went in the water twice to see if prop or rudder have any thing on the, but they are clear. Please help
Thank You Bxxxx xxxxxxx ***@******.***
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Answered in 8 minutes by:
9/11/2015
Marine Mechanic: Tan, MerCruiser Certified Technician replied 7 years ago
Tan
Tan, MerCruiser Certified Technician
Category: Boat
Satisfied Customers: 11,507
Experience: 40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.
Verified

Hello Bill. My name is Tan.

This will take more than one reply to solve your issue.

Do you have separate fuel tanks?

When you say you swapped fuel pick up lines did you run the stbd engine on the port tank?

There is no governor on the transmission.

Have you done a compression test?

The engine will rev to 4000 rpms with no load as it doesn't require as much fuel and it isn't under a load. If you have low or no compression on one or more cylinders the engine will still rev to 4000 with no load. In neutral no load isn't a true test as we can see it doesn't turn up under a load.

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Customer reply replied 7 years ago
1 300 Gal tank for both engines
I have not done a compression test yet
Marine Mechanic: Tan, MerCruiser Certified Technician replied 7 years ago

Ok lets do a compression test to eliminate this as a possible cause of the issue. Is this boat used in fresh or salt water?

What did the spark plugs look like when you changed them?

When you switched the fuel pickup hoses did the port engine run ok on the stbd pick up hose?

Tan
Tan, MerCruiser Certified Technician
Category: Boat
Satisfied Customers: 11,507
Experience: 40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.
Verified
Tan and 87 other Boat Specialists are ready to help you
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Customer reply replied 7 years ago
I will to a compression test on Sunday
Spark plugs looked ok dry and no carbon bild up
The Port engine work good on the starboard pick up hose
Tan how can I get you on the phone after I do the Compression test
Thanks xxxx xxxxxxx
Marine Mechanic: Tan, MerCruiser Certified Technician replied 7 years ago

Bill I will send you a link or you can request a phone call. I work every day so you can get in touch with me any days PST 8 to 7.

Just post back when you are ready and I will send you the link.

Thank you.........Tan

Will talk later.

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Customer reply replied 7 years ago
Hi Tan
I did a compression test on both engines all readings are with in 5 lbs at 122. the pres. should be 130-
150 in my crusader book I think for a engine that is 26 years old that is ok. The boat is out of the water
now, so I will chase this problem next May If you can think of any thing to help please let me know.
Thanks for your help
Bill
Marine Mechanic: Tan, MerCruiser Certified Technician replied 7 years ago

Ok BIll. We need to put a clear fuel hose on the suction side of the fuel pump run the engine look for air bubbles. Check the timing is advancing when throttling up.

If you have the Prestolite ignition you could have an issue with springs being broken on the advance. If you have Delco EST then we just need to verify the timing is advancing.

Post back when have the chance to do these checks.

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Tan
Tan
Tan, MerCruiser Certified Technician
Category: Boat
Satisfied Customers: 11,507
11,507 Satisfied Customers
Experience: 40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.

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