Thread: Cracked exhaust manifold
07-23-2012, 02:13 PM #1
Cracked exhaust manifold
Any idea what would cause an exhaust manifold to crack?
I finally got the ski back on the water yesterday, after nearly a year off the water.
Tested it on the hose, running great. Got it on the water, running great for most of the day. Then, later on when I went out again from the beach, I was only getting 5000 rpm instead of the usual 7000! She was also getting quite unstable & twitchy.
Got her into a nearby beach & found that the hull was almost full with water. Started her up in neutral to operate the bilge pump (without draining the battery) and found that there was water **ssing out of the side of the exhaust manifold, near, but not on, the joint of the main pipe.
I've split the offending object off now & have found that the whole top section is nearly falling off with a 5" split down one side of the pipe and a crack virtually all the way round where the pipe bolts on!
Any ideas as to what would cause this issue?
I now need another exhaust manifold & gaskets to get her back on the water, but don't want the same thing to happen again.
I will take some photos to try to show the split.
07-23-2012, 02:24 PM #2
07-23-2012, 02:26 PM #3
07-23-2012, 09:51 PM #4
- Join Date
- Jul 2007
- near Toronto, Canada
Incorrect bolt torque?
Incorrect or missing spacer/washers on the lower mounting points?
(Going from memory on this last one. I forget which engines have some flat spacers between the manifold bosses and the engine case)
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