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Old Merc. 350 mag heating up.

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Old 07-29-2008, 09:41 AM
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you should also check the water hose that runs from the drive bell housing to the transom assembly. it can kink and restrict water flow. how olds are the manifolds and risers? they do not live long.
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Old 07-29-2008, 10:29 AM
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[QUOTE=mrv8outboard;2637917]you should also check the water hose that runs from the drive bell housing to the transom assembly. it can kink and restrict water flow. how olds are the manifolds and risers? they do not live long.[/QUOTE]

I think they about 10+ years. The boat was repowered late 90's.
THanks I'll check..
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Old 07-30-2008, 11:26 AM
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I'm having a simular problem with my older 350 too. Haven't had time to go thru everything yet, but so far, its not the raw water pump or the thermostat. Haven't had time to check hoses or drive intake area for issues. Have been wondering if maybe the risers are partially blocked. In your case, have you checked the ignition timing? If its too far off, that can cause overheating.

I'm curious as to what you find the problem to be.

Good luck

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Old 07-30-2008, 02:30 PM
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Quote:
Originally Posted by AGGRAVATION28 View Post
I'm having a simular problem with my older 350 too. Haven't had time to go thru everything yet, but so far, its not the raw water pump or the thermostat. Haven't had time to check hoses or drive intake area for issues. Have been wondering if maybe the risers are partially blocked. In your case, have you checked the ignition timing? If its too far off, that can cause overheating.

I'm curious as to what you find the problem to be.

Good luck

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I will let you know what I find this weekend.. Serious trouble shooting are in the plans.
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Old 08-05-2008, 11:07 AM
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Paradox

Any luck with the trouble shooting?
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Old 08-05-2008, 11:15 AM
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Water ports in exh. manifold/risers are a good canidate for overheating.

Last edited by tmdog; 08-05-2008 at 11:16 AM. Reason: add on
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Old 08-05-2008, 12:35 PM
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Water is flowing free everywhere. Have to check the timing. and tune up isues next. Possible thermostat issue. or circulating pump... but the lines, risers etc. are good.
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