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kenny nunez replied to the thread Mercruiser 3.7/470 Overheat Problem.

You have a head gasket leak. What you are describing is a common problem. Have a valve job done and get the head resurfaced. You will...

Aug 25, 2025
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kenny nunez replied to the thread Mercruiser 165 6cyl inline dies when boat is in the water.

In that case try the 6 gallon outboard method. This is a tried and true way to locate fuel problems, or rule it out.

Aug 24, 2025
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kenny nunez replied to the thread Timing mod: running or not running engine.

For me to keep from having to turn on & off the water & jumping in and out the boat I also set the dwell like SD. I then attach the...

Aug 24, 2025
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kenny nunez replied to the thread Mercruiser 165 6cyl inline dies when boat is in the water.

In post#4 you said that with an electric fuel pump the engine runs. Am I wrong the way I am interpreting that? Have you ever tried by...

Aug 24, 2025
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kenny nunez replied to the thread Mercruiser 3.0 won't "lock in".

If the splines completely went away there has to be a alignment problem. sierra #18-2321 looks like the coupler that you need Mercruiser...

Aug 22, 2025
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kenny nunez replied to the thread Mercruiser 3.0 won't "lock in".

A very good chance the vertical shaft is the problem.

Aug 21, 2025
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kenny nunez replied to the thread Alignment adjustment, witness marks.

If you have a small bottle jack or an overhead hoist loosen the mounts and either under the harmonic balancer with the jack or with the...

Aug 21, 2025
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kenny nunez replied to the thread How would a compromised bellows sink the boat?.

The 2 “O “ rings on the driveshaft are there to grip the gimbal bearing. There is usually a 1/4” breather hole at the 12 o clock...

Aug 21, 2025
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kenny nunez replied to the thread Mercruiser 3.0 won't "lock in".

There is a tutorial on this site on how to adjust the shift cable.

Aug 21, 2025
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kenny nunez replied to the thread Mercruiser 409 engine severe vibration issue.

It has to be a flywheel problem. And maybe the wrong harmonic balancer.

Aug 21, 2025
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kenny nunez replied to the thread 1996 OMC Cobra (Ford 302 / VolvoSX collaboration) sometimes runs hot.

Remove the hose from the drive to the raw water pump. Try reverse flowing that hose into the drive with the drive up, look at the...

Aug 19, 2025
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kenny nunez replied to the thread are there boat "salvage yards" anywhere in the U.S.?.

The Boat Yard in Marrero,La. Across the river from New Orleans.

Aug 18, 2025
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kenny nunez replied to the thread Pre Alpha Mercruiser lower shift shaft removal?.

Once the bushing is removed the shaft can be pulled out. If the shift shaft is stainless steel leave it and install the new bushing...

Aug 18, 2025
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kenny nunez replied to the thread Pre Alpha Mercruiser lower shift shaft removal?.

Do not keep trying to pull the shaft out! There is a small clip and a washer under the bushing, if the clip should break it falls into...

Aug 18, 2025
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kenny nunez replied to the thread A-Mercruiser I-Drive Unit: pre-load required?.

The washer should be slightly ‘cupped”and you see where the nut contacted it so be sure to put some Loctite on the threads. The nut...

Aug 18, 2025

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