Loss of power on a Yanmar 1GM10? - SailNet Community
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post #1 of 8 Old 05-18-2011 Thread Starter
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Loss of power on a Yanmar 1GM10?

Would a clogged up mixing elbow cause loss of power on a Yanmar 1GM10? This loss has been extremely gradual.

L.
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post #2 of 8 Old 05-18-2011
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Originally Posted by lawsonmitchell View Post
Would a clogged up mixing elbow cause loss of power on a Yanmar 1GM10? This loss has been extremely gradual.

L.
From what I understand yes. Take the hoses off and inspected for a carbon blockage. I understand you can clean it out, but will not last long as it will probably be rusted out. If it is clogged get a replacement. Yanmar says these are wear items.
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post #3 of 8 Old 05-18-2011
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Yes... sounds typical.....

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post #4 of 8 Old 05-18-2011
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It,s so common I,m gona check out my exhaust next time I,m servicing the engine.
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It,s so common I,m gona check out my exhaust next time I,m servicing the engine.
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I bought a spare mixing elbow for my Yanmar 3gmd just in case. That way if I need it, which someday I will. I have it and do not need to wait if it is back ordered. They are kinda expensive- about $150 as I remember.
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post #6 of 8 Old 06-14-2011
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Quote:
Originally Posted by lawsonmitchell View Post
Would a clogged up mixing elbow cause loss of power on a Yanmar 1GM10? This loss has been extremely gradual.

L.
Yes it will, but what makes you think that's the issue? Loss of power is characterized by lower revs at full throttle and is most commonly caused by:

1.) a dirty bottom
2.) barnacles on propeller and shaft
3.) air in the fuel system
4.) clogged fuel filters
5.) old diesel fuel (new low sulfur fuel needs a stabilizer additive)
6.) lastly, dirty injector

I have two of these little gems in my boat and they're good little engines. You'd be wise to check these items first before you reach for your checkbook.
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Last edited by TropicCat; 06-14-2011 at 09:23 PM.
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Re: Loss of power on a Yanmar 1GM10?

same thing happened to my ysm8 rebuilt it same thing turned out head was bad had rusted through just an idea
good luck
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post #8 of 8 Old 07-31-2014
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Re: Loss of power on a Yanmar 1GM10?

Are you sure it's the engine?

Note that for it to be an engine problem you'd have to be seeing lower RPM's, not just slower boat speed.

If it's slower boat speed but normal RPM's then it's not the engine - it's bottom growth or weight increases.

If you're seeing lower RPM's at least make sure to check the prop for excessive growth before digging deep into the engine.
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