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devilray snob
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2,398 Posts
Discussion Starter · #1 ·
Cut/creek et al;

What maintenance/checks can be done on the old 1999-2005 merc 2-stroke 40/50/60 outboards oil injection pumps?

I've read that sometimes the oil pump can sometimes just stop working unbeknownst to the operator and just fry the block with no warning.

My '99 has been running 100% and I dont know if anything was ever done to the oil system.

Is it just one of those things where it's like..."oh well, time for a new motor!" if it goes out?

I know you can switch to pre-mix to avoid this but that defeats the purpose of having an 'advanced' motor...if I wanted to do pre-mix I would buy a barebones 25.
 

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I Love microskiff.com!
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587 Posts
Good question.
I'm curious about this as well on my 90 merc
 

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I love my microskiff
1998 AC 1890 Gheenoe 13HS
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353 Posts
I disabled my injection system three years ago. I have a 2001 Mercury 90 2 stroke. I went to pre-mix and never looked back. 
 

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devilray snob
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2,398 Posts
Discussion Starter · #5 ·
Not the answer I was looking for but thanks. Pre-mixing defeats the purpose of owning a motor with advanced features...

I guess there's nothing that can be done to the oil system as maintenance :(
 

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1,544 Posts
Matty, other than an inspection and oil drip test nothing can be done. The issue with the oil pumps was really on the earlier models, they had a nylon gear on the crank shaft and a metal gear on the oil pump rod, over time the nylon gear would strip.

The newer Model enignes 2000's had far fewer issues.

Creek
 

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Cert. Yamaha technician
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4,330 Posts
What creek said, he bronze gear setups are almost bulletproof. The only other thing that can cause an issue is frequently mixing different brand 2 stroke oils.

The benefit of oil injection is reduced oil consumption, cleaner burning.
 

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devilray snob
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2,398 Posts
Discussion Starter · #9 ·
What creek said, he bronze gear setups are almost bulletproof. The only other thing that can cause an issue is frequently mixing different brand 2 stroke oils.

The benefit of oil injection is reduced oil consumption, cleaner burning.
So if I'm a 99 I probably have the bronze/metal gear pump parts? As long as I have the 'newer' iteration model of the 3cyl motor that started in 1999.5ish?

Also what is this 'oil drip test' I don't see any reference to it in the service manual.
 

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Cert. Yamaha technician
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4,330 Posts
What creek said, he bronze gear setups are almost bulletproof. The only other thing that can cause an issue is frequently mixing different brand 2 stroke oils.

The benefit of oil injection is reduced oil consumption, cleaner burning.
So if I'm a 99 I probably have the bronze/metal gear pump parts? As long as I have the 'newer' iteration model of the 3cyl motor that started in 1999.5ish?

Also what is this 'oil drip test' I don't see any reference to it in the service manual.
That is a question for Creek, i dont do Mercs, he does. So i dont onow any specifics on your motor
 
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