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TOPIC: engine temp?

engine temp? 21 Jun 2009 00:13 #1

  • katthater
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just replaced my thermostat,new oil, new risers, new manifolds etc...
what is a good temp my volvo penta aq211a(305 chev) should be running at?

i have noticed just idle, both risers cold...temp gauge reading 110-120.
out cruising, when i open her up it will reach 170-180. is this ok?

also, one side riser is warmer than the other.....what can i check?

also, when i do open her up and and she gets hotter, cools back to 110-120 pretty quickly once i ease off the throttle.
some advice please guys....
thanks in advance...
oh, she does have a heat exchanger.

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engine temp? 21 Jun 2009 01:40 #2

  • scottwinter40
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I have a 2000 Bayliner with the 5.0 liter and it runs at 175 after it has warmed up. I also have one side of the exhust manafold that is cooler than the other one. The factory service people said that is common. Mine is also freah water cooled.:)

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engine temp? 21 Jun 2009 02:02 #3

  • danfrompgh
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Mine also runs 170-175 with one side feeling cooler than the other. Mine has never run back down to 110-120 after it reaches normal op temp. Somethings not right,gauge or stat.

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engine temp? 21 Jun 2009 02:04 #4

  • katthater
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danfrompgh;312605 wrote: Mine also runs 170-175 with one side feeling cooler than the other. Mine has never run back down to 110-120 after it reaches normal op temp. Somethings not right,gauge or stat.


what is normal op temp?

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engine temp? 21 Jun 2009 02:19 #5

  • 2850Bounty
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OK, temp with the closed cooling system can be in the range of 160-180*.

The most likely reason for the uneven exhaust system temp is the diverter unit (sort of a T fitting) for the spent sea water that is leaving the H/E.
This is very likely a copper T or Y looking fitting.... painted!
It will have an internal divider member to divert the flow evenly to each exhaust side.
Problem is, there were some made that do not divert this water evenly..... although seldom a real issue.
Find which side is cooler, you may be able to tweak the member inside and correct this some.


Also, look at your Riser-to-Y pipe rubber couplers (hoses)..... if clamped too close, or over the top of, the portion where the spent water enters the exhaust, it will restrict flow causing this side to run warm.... maybe even cause an engine to run warm!

Notice the "scalloped" areas where the water enters the main exhaust section...... we can not have a clamp over this section of the riser! :hammer
Well, you can..... but eventually, it will start to close down this area!

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For some reason, the ones we buy via Volvo Penta p/n or Sierra p/n are almost always too short.... resulting in clamps in the wrong location making this near impossible to avoid.
This is easily corrected with new, cut-to-order, by-the-foot, couplers (metric size hose, btw) clamped at the correct location at the Riser.

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Rick E. Portland, Oregon
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Twin 270 HP 5.7's w/ Closed Cooling
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engine temp? 21 Jun 2009 02:46 #6

  • katthater
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my water from the heat exchanger goes from two hoses that run to the manifolds via an l shaped fitting, one for each side.... is that what your talking about?

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engine temp? 21 Jun 2009 02:56 #7

  • MikeValent
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I don't think your question about engine temp got fully answered. 180 or so is good closed cooling running temp, but the only way the engine would cool quickly back down to 120 or less would be if the new thermostat is defective.

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engine temp? 21 Jun 2009 17:17 #8

  • JohnL
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As Mike said, the engine temp should run somewhat close to the thermostat spec, usually 145 or 160 I think. If the engine is working really hard it can be a little hotter, but if it gets much hotter then there is likely something wrong in the cooling system such as corrosion and or blockage.

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