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Old 07-26-2015, 11:01 PM   #1
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Default Dual Engines - one hotter than the other

This has been driving me nuts and I have not been able to find the problem. I have a 2005 3300 I purchased last September, with 67 hours on each engine,(merc 5.0 MPI) last fall it ran fine and I did not notice any temp difference between the engines. Over the winter I had the dry joint manifolds and elbows replaced as well as all the bellows shift cables and impellers. I noticed in the spring, although everything ran great, the port engine would cruise at around 190- 192 and starboard would be around 180 on the gages. I thought it was odd but didn't worry too much until while on a 3 hour cruise at 3200 rpm the port engine alarm went off momentarily, I shut it down to cool then proceeded at 3000 rpm with no further alarms. Return trip kept it at 3000 rpms and no alarms.

Back at the dock I temped the engines with an infared thermometer at 2000 rpms
Port thermostat housing 167deg.(dash gage 185) Starboard 162(dash gage 175)

Port Dry Joint Manifolds 181deg. Starboard 150deg.
Port Elbow 82deg. Starboard 82deg.

I replaced the port impeller, and thermostat and no change,
I checked the power steering oil cooler it is clean
I switched temp the sending units and no change
I switched the dash gages and the port gage did seem to run a couple degrees hotter
at one point when I was replacing the thermostat it went together with a gap and the port engine would not get any hotter than 125deg. I re-seated the thermometer and it warmed up to 185 - I think this tells me that there is not a restriction in the engine

I cant think what else to check? any thoughts? has anyone else had this issue??

Thanks
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Old 07-27-2015, 03:04 AM   #2
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We're both port manifolds 181?

I would run the boat on plane for about 10 minutes and retake the readings.

What drives do you have?
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Old 07-27-2015, 05:30 PM   #3
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To clarify port engine port manifold 181

Starboard engine port manifold 150

I don't recall what the starboard manifolds were but they were basically close to the port and didn't seem much different so I didn't take note but I can next time I am out

What are the exact areas I should take temps at?

The drives are Bravo 3
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Old 07-27-2015, 08:47 PM   #4
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Quote:
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To clarify port engine port manifold 181

Starboard engine port manifold 150

I don't recall what the starboard manifolds were but they were basically close to the port and didn't seem much different so I didn't take note but I can next time I am out

What are the exact areas I should take temps at?

The drives are Bravo 3
Thanks
Rich
Coolant hoses into manifolds, tops of manifolds, tops is risers, exhaust hose coming of risers.
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Old 07-28-2015, 01:16 AM   #5
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I probably won't get the boat out until the weekend but as soon as I can I will get and post all those temps. There are two hoses that go into the bottom of the manifiold with some sort of check valve the top one is from the thermostat the bottom one is from the intake cold water distribution manifiold that is before the engine circulating pump. I assume you are asking for the temp of the hose from the manifold
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Old 07-28-2015, 01:59 AM   #6
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Do you have closed cooling?

I do not recall ever seeing what you are describing.

Typical is one hose from t-stat housing to a fitting that has a drain plug for winterizing.

Got any pictures?
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Old 07-28-2015, 02:41 AM   #7
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It is raw water cooled not a closed system. I can grab a picture when I a on the boat. Here is a link to the part from the internet

nexthttp://cdn2.bigcommerce.com/server1500/aba1d/products/121/images/293/22_863786A1__94018.1389904543.1280.1280.JPG?c=2
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Old 07-28-2015, 03:01 AM   #8
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Link does not work
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Old 07-28-2015, 03:11 AM   #9
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Please try this one

http://www.michiganmotorz.com/images...te_456_272.jpg

The meecruiser part number is 22-863786A
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Old 07-28-2015, 11:34 AM   #10
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Please try this one

http://www.michiganmotorz.com/images...te_456_272.jpg

The meecruiser part number is 22-863786A
Interesting not see that before. going to see if I can find a diagram of your cooling set up but some pictures would be nice when you can get them.
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