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Old 05-29-2018, 09:04 PM
Dino Don's Avatar
Dino Don Dino Don is offline
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Boat: mastercraft 190 1987 351 Indmar
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One exhaust manifold running cool...other side running hot

1987 P/Star 190 rh manifold operating cool, lh running hot with #5 cylinder not firing right and #6 not firing right. Compression good, cylinder leak down test good ...manifold good not rusted out. Wites good, new plugs, pulled wires while running and everything hot but #5 still seemed to be missing. Anybody ever had issues with muffler being restricted?
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Old 05-29-2018, 09:11 PM
waterlogged882 waterlogged882 is offline
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Quote:
Originally Posted by Dino Don View Post
................ Anybody ever had issues with muffler being restricted?
Yes.

Check the internal condition of your exhaust hose. They do collapse and restrict flow for proper cooling. I have had one to form a pocket (internally) and flow back into the riser.

Me personally, I remove the risers to work the hose(s) much easier. Two new gaskets and put the riser back on very last.

Two different hoses from personal experience. I have even found large pieces of hose wedged inside the mufflers that could not blow by the baffles.

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Old 05-29-2018, 10:15 PM
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Dino Don Dino Don is offline
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Boat: mastercraft 190 1987 351 Indmar
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Got the riser off and off the manifold will check it tomorrow to see if it is obstructed. Never changed and of it brought it new in 87.
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