Re: Persistent TMD22 overheating


Patrick McAneny
 

Alex, That sounds like money not well spent. In my case I had checked my engine many times with two different inferred guns and had temps well over 200 F., especially at higher rpms. 
Pat
SM Shenanigans


-----Original Message-----
From: Alexandre Uster von Baar via groups.io <uster@...>
To: main@AmelYachtOwners.groups.io <main@AmelYachtOwners.groups.io>
Sent: Sun, Sep 5, 2021 5:35 pm
Subject: Re: [AmelYachtOwners] Persistent TMD22 overheating

In 2015 I spent a fortune ($8000) to solve a false overheating…. 
Cleaned intercooler, rebuilt injectors, gage calibrated, etc.  
At the end, it was simply the wire from the engine to the gage which, with age, had higher resistance…. The mechanic never find the cause, I only found it, by putting a 2nd temperature gage…. 

Sincerely, Alexandre

On Sunday, September 5, 2021, 01:02:39 PM AST, Jose Venegas via groups.io <josegvenegas@...> wrote:


Pat,

Can you be more specific about the sleeve, or lack of, that caused the overheating of your Volvo TMD22?  Ipanema has persistent overheating at high RPM after cleaning with BB both heat exchangers and having ruled out most of the potential causes described by Bill Rouse on his manual that he recently posted and I am copying below.

BTW, I would add two more potential causes:
1) A small leak of air into the freshwater pathway upstream of the pump. This leak only shows as a small collection of salt around the hose connections when the engine is not running but is enough to allow entry of air that increases as the engine RMP increase.  A similar entry can occur through the seal of the seawater strainer cap.  The effect can be exaggerated by a minor restriction of the pathway upstream of the leak.  I recently fixed such a leak and the engine temperature came down (205 F) but I think it is still too high.

2) A calibration error on the temperature sensor/gauge system.  This gave me a difficult time a year ago as I was arriving in Curazao and was caused by corrosion of electrical connections.  
   
Quoted from Bill Rouse's Post:

Possible Causes of Overheating:

1. Restricted seawater flow anywhere in the pathway beginning with the seawater entry into the sea chest to the seawater and exhaust exit through the hull. 
a. Sea Chest restriction
b. Hose restriction or kink
c. Restriction at the input to the in-line transmission oil cooler, if equipped
d. Failing seawater pump and/or failing seawater impeller
e. Restricted Exhaust Elbow
2. Restricted Coolant water flow
a. Failing coolant water pump
b. Failing Pressure Cap (should be replaced every 2 years)
c. Failing and/or clogged Heat Exchanger
3. Incorrect coolant ratio, but this is usually not a major contributor but will contribute somewhat.
4. Incorrect V-Belt tensioning with the V-Belt turning the coolant water pump
5. Failing Coolant Thermostat (not opening completely)
6. Other engine issues"
 

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