c.2000 Mercury 135-HP Suddenly Stops

Repair or modification of Boston Whaler boats, their engines, trailers, and gear
Scarab
Posts: 8
Joined: Sun Apr 02, 2017 2:32 am

c.2000 Mercury 135-HP Suddenly Stops

Postby Scarab » Sun Oct 22, 2017 1:49 am

I have a 2000 Mercury 135-HP outboard enginel with 118-hours of operating time. Just yesterday, while running at 4,000-RPM at 45-MPH, the engine suddenly stopped. When started again it stalled at low RPM when in gear and couldn't get on the boat to accelerate to plane.

Due to the fact that I heard a weird non-metallic noise, I poured oil into the [fuel tank] and checked the fuel lines. The noise stopped and the engine performs well at high speeds, however it still stalls when in gear to plane. [The cause of the stalling] has to be something with the fuel and the fuel pump. [Give me] ideas.

jimh
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Re: c.2000 Mercury 135-HP Suddenly Stops

Postby jimh » Sun Oct 22, 2017 12:45 pm

As a general rule, if an engine that is running normally and then immediately and suddenly stops, the cause will tend to be electrical. If the cause were due to a fuel restriction, the engine would tend to lose speed more gradually as the fuel in each cylinder's fuel source began to run out.

What sort of c.2000 Mercury 135-HP engine are we discussing? Give more details about the engine and the method of fuel induction.

Is this engine an OptiMax model?

I don't think that adding some two-cycle-engine oil to the fuel tank would cause an immediate cessation of any noise. The new fuel-oil mixture would tank a minute or two to flow into the engine and become the fuel being introduced into the cylinders.

Scarab
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Re: c.2000 Mercury 135-HP Suddenly Stops

Postby Scarab » Sun Oct 22, 2017 2:59 pm

This is a V6 135hp ELPTO with s/n OG913805.

Scarab
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Re: c.2000 Mercury 135-HP Suddenly Stops

Postby Scarab » Sun Oct 22, 2017 3:43 pm

On second thought: I might have run the engine [with the battery switch in the] BOTH setting. Would that cause this result?

What should I do now?

jimh
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Location: Michigan, Lower Peninsula
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Re: c.2000 Mercury 135-HP Suddenly Stops

Postby jimh » Sun Oct 22, 2017 5:47 pm

Do you have the factory SERVICE MANUAL for this engine? If not, getting the manual is the first step in doing your own service on the engine. Generally a factory service manual will have some diagnostic advice.

Don SSDD
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Location: Nova Scotia

Re: c.2000 Mercury 135-HP Suddenly Stops

Postby Don SSDD » Sun Oct 22, 2017 7:33 pm

Scarab wrote:On second thought: I might have run the engine [with the battery switch in the] BOTH setting. Would that cause this result?

What should I do now?


The battery switch in both would not effect engine operation.
1986 Outrage 18 with 2001 Honda 130 HP
Former Owner 1991 Guardian 19 with 1994 Evinrude V4 140HP
Former owner 1987 Montauk with 1998 Mercury 90HP
Nova Scotia

Scarab
Posts: 8
Joined: Sun Apr 02, 2017 2:32 am

Re: c.2000 Mercury 135-HP Suddenly Stops

Postby Scarab » Sat Jan 06, 2018 4:54 am

Just for the record, after checking the engine, the problem was that one cylinder stopped working when the engine stopped at WOT. When I restarted and added extra oil into the fuel tank, the engine was running with the remaining five cylinders.

When I checked the compression in {the non-working] cylinder it was 0-PSI.

A mechanic told me that half of the engine has 125-PSI compression and the other half 110-PSI. The sixth cylinder has no compression at all.

The probable cause: the oil injection not running correctly.

Thanks again. All the best for a Happy and Healthy 2018!