Closed cooling, risers only, manifolds are anti-freeze cooled. Just completed season 6 on the risers, so it should be time for replacement. It is a Gen 5 Mercruiser, I am seeing dry joint, wet joint, 7 degree, 14 degree.........??
I looked at the past repair order and the repair mechanic just said "2 risers" no part numbers!
SO, any input to dry joint, wet? I know that they can be inspected, but to pull all 4 off, then put them back on if they look OK, just doesn't make sense to me.
1994 7.4 390CPMY Mercruiser risers
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tonyiiiafl
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paulr
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Re: 1994 7.4 390CPMY Mercruiser risers
Take them off and change now. I learned the hard way.
Why risk a 4-$5000 rerpair.
Why risk a 4-$5000 rerpair.
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tonyiiiafl
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km1125
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Re: 1994 7.4 390CPMY Mercruiser risers
Yea, for the amount of work to get the old ones off, I'd just replace with new rather than risk trying to reuse them. You'd need some advanced testing to really validate the old ones anyways. You could validate that they're not already leaking, but could not really validate that they have any certain amount of "life" left in them.
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paulr
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Re: 1994 7.4 390CPMY Mercruiser risers
The company i work for does this testing on all the pipe we install that carries corrosive materials before its installed.
Period tests over time indicates the rate of ware. When it gets to 30% - 40% of original we change them out.
On a reiser or elbow there is no way to test the interior wall of the elbow that will fail.
The only thing you can do is change them or gambel. I see it everyyear at my marine in NJ
Period tests over time indicates the rate of ware. When it gets to 30% - 40% of original we change them out.
On a reiser or elbow there is no way to test the interior wall of the elbow that will fail.
The only thing you can do is change them or gambel. I see it everyyear at my marine in NJ
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