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#1
06-14-2013, 07:22 PM
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maristar 200 overheating
My maristar, 350 engine, vdrive, overheats when under load. idleing it will stay around 160. I have replaced the impeller, cleaned all debri. It ran great for approximately 20 hours. then it started this. Anything over 1200 rpm it starts to overheat. Ive never let it get over 200, but cant figure out. replaced the thermostat. the old one looked suspect. still occurring. I just pulled the hose to the tranny cooler, raw water pickup. no screen that I can detect. Do I have to open the trainny cooler for the screen. Is it on the port side of the tranny... stumped
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#2
06-14-2013, 09:11 PM
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Check to make sure you didn't get the short impeller. They make a 1 7/8" and 2" (what our boats take). They look identical but won't prime well and overheat above idle. Impeller should have no end clearance against the cover.
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#3
06-14-2013, 09:29 PM
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hmm i just buttoned everything up. But I will say, I believe it goes to the end of the space. And the boat probably ran 3 to 4 hours on this impeller with no over heating problems. I am trying to take it for a test drive tomorrow, I will report back. Hey what do you think about faulty gauge. how to check. I notice that the gauge is now stuck on 160 when shut down...
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#4
06-14-2013, 11:05 PM
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Quote:
 . Check your thermostat. Also I have seen a brand new impeller get chewed up from a small piece of debris. Worth a check. Also the diagnosis on the size of impeller sounds very viable to me. It's worth researching wherever you bought it to find out and be 100% sure Sent from my HTC One using Tapatalk 2
__________________
 When I was a child, I used to talk as a child, think as a child, reason as a child; when I became a man, I put aside childish things.
1 Corinthians Chapter 13 - 11
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#5
06-15-2013, 03:07 AM
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pick up some crap and its clogging the RAW waster intake line, trans cooler clogged, impeller wrong or burned up missing fins?
__________________
Tim "Heavy" beer is for wine drinkers that are too embarrassed to drink wine in front of their buddies. "Light" beer is a drinkin' man's beer!
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#6
06-15-2013, 07:32 AM
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Remove hoses from both ends of trans cooler, look for seaweed/debris at the intake end. Back flush it with a garden hose until you are sure nothing is in there. Reverse flush your intake grate the same way.
__________________
I was njskier on here.
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#7
06-15-2013, 09:40 AM
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thank you everyone for the advice. It does seem to be a straight forward cooling system. I have backflushed the trans cooler screens. I have good flow. There is no obstruction in the pickup end thru the floor. The impeller looks good. I didnt check for size yet. Thermostat is new. Not sure why all gauges, except oil pressure gauge, are stuck where they were when boat last shut down... that is a bit troubling. I will probably open up down there this weekend.... Taking for a test drive this afternoon. I will report back. ps, when it was getting hot, notice excessive white smoke from the exhaust.
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#8
06-15-2013, 09:48 AM
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Quote:
 that sounds like a head gasket.
__________________
When I was a child, I used to talk as a child, think as a child, reason as a child; when I became a man, I put aside childish things.
1 Corinthians Chapter 13 - 11
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#9
06-15-2013, 10:07 AM
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Quote:
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