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Old 23 November 2015, 13:20   #1
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Country: USA
Town: Brighton Michigan
Boat name: AWOL
Make: Zodiac
Length: 7m +
Engine: Yanmar diesel
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Yanmar 6lpa maintenance

I am doing routine maintenance on my 6lp .

Decided this year to also inspect exhaust mix elbow,it seems to work fine but I have never had it off .

Remved elbow, looks to be in good shape until I clean it up and take a close look and find 2
small cracks near water passages.

Engine has around 600hrs.

I have read where some say go stainless,this one I believe is cast.

Any advice or comments appreciated.
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Old 23 November 2015, 15:28   #2
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Country: UK - Scotland
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Boat name: charlie girl
Make: reiver 3.8/regal3760
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Engine: 40hp 2st 2x6lp 315
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That small crack in the base won't do much harm untill it's much bigger (if it gets bigger) I'd just keep an eye on it now & then
Not seen any stainless ones for 6lp's but there's an original one on boats and outboards just now
The thing many people ignore is the need to strip & clean the intercooler core they often corrode between the brass core and the aluminium case which distorts the end caps
It's not a massive job but if left too long a it splits the housing and a new cooler is something like 2k
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Old 24 November 2015, 14:51   #3
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beamishken thank you so much for your good advice.
intercooler is now on my maint short list.
should I remove the entire cooler to clean or just the end caps ?
any advice would be great thanks.
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Old 24 November 2015, 15:27   #4
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Country: UK - Scotland
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Engine: 40hp 2st 2x6lp 315
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Hi personally I'd take the Cooler off its only 6 bolts and the hoses the gasket usually comes off in tact and can be re used with a smear of silicone.
The entire core slides out once you remove both the end caps. Note the orientation before you slide it out
I clean the air side fins with a strong water soluble degreaser then clean it with a steam cleaner just be carefull the pressure doesn't distort the fins
The water side tubes I pour brick acid or patio cleaner through and catch it in a bowl untill it stops fizzing then wash with water to neutralise the acid
I'm not sure if it's listed as a job in the service schedule but it is on a lot of marine engines and is often overlooked untill it's too late
Best of luck with it
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Old 24 November 2015, 15:54   #5
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beamishken thanks again for your time,I will get on that cooler project soon.
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