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  #46  
Old 08-04-2015, 11:17 AM
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Quote:
Originally Posted by mach4 View Post
I tested the pressure relief valve and it works fine. Takes a fair amount of pressure, but that's to be expected given the pressure it's designed to open at. Haven't made a tool to open it up so can't comment on that aspect.
I pushed on it pretty hard and it did not budge one bit. My guess about 30 lbs. I did not want to push harder in fear of slipping and breaking the plastic valve.
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  #47  
Old 08-04-2015, 11:20 AM
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I ordered a new T stat and 2 Mercedes gaskets from ECS. Should be here next week.
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  #48  
Old 08-04-2015, 11:26 AM
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A rough estimate is that it should take about 20 pounds of pressure. Assuming about .5 inches diameter for the valve, that's about .2 sq in. It opens at 110 psi which means it should take 20 pounds of force or so on the valve itself to open...which is pretty much what I estimate I used to open it.
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  #49  
Old 08-04-2015, 11:30 AM
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So my (spare housing) must be stuck somehow. I have not managed to unscrew the cap yet with the tool I made. Need to secure the housing better and put a longer handle on the tool so I can apply more torque.
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  #50  
Old 08-04-2015, 05:21 PM
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Originally Posted by funola View Post
So my (spare housing) must be stuck somehow. I have not managed to unscrew the cap yet with the tool I made. Need to secure the housing better and put a longer handle on the tool so I can apply more torque.
I pushed again with a stick, right in the center and it opened this time. I think I pushed off center last time and that's why it didn't budge.
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  #51  
Old 08-04-2015, 05:25 PM
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I did what Mercedes says not to do, heat up the stat way above 60 C and got the pin fully extended and finally out so that I can insert the stat in the housing to do a fully closed stat test. The tip of the pin has a black substance on it. If the wax is not black, then it got contamininated by oil. Maybe that's why this stat was over extended?



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Last edited by funola; 08-04-2015 at 05:39 PM.
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  #52  
Old 08-04-2015, 05:35 PM
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I don't have a pic for this test but with the stat in the housing and a stick pushing the stat against the housing to simulate the spring, I poured water into the piston. The water drained out pretty quick out of those 4 small holes in the piston. the only path out of there. Water is much thinner than oil viscosity wise and drains faster than oil but with the stat totally closed, the path from the stat to the oil cooler is not totally sealed.

Has anyone performed the FSM oil temp stat test and got the results as described (abrupt rise in oil cooler temp when the oil reaches 95 to 110 C depending which temp stat you have)?
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  #53  
Old 08-04-2015, 05:38 PM
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Quote:
Originally Posted by charmalu View Post
Here is a note in my FSM for the 617.95 engine under section 18-125.

Remove functioning thermostat only at temperatures
below 60c, since otherwise the thrust pin will
be pushed out.

Never pull thrust pin out of a wax thermostat.
since otherwise proper function cannot be guaranteed.

Charlie

sent from my pos computer
Hey Charlie, I pulled the pin out and your pm is full!
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  #54  
Old 08-04-2015, 06:36 PM
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Quote:
Originally Posted by OM617YOTA View Post
Based on your oil thermostat threads, I fired up my truck and let it run while monitoring oil filter housing and oil cooler temperatures with a non-contact IR thermometer. Both were within a degree of each other from when first started, and topped out at 165 degrees or so. Granted this is measuring the housing and not the oil itself and also only at idle(albeit at 104F ambient temp).

Clearly my oil thermostat has failed as well.
So, you did not get an abrupt rise of oil cooler temp as the engine got to operating temp, same results as me and mach4, which would indicate the oil cooler T stat has failed open. That's 100% of the sample size of 3 (me, mach3 and you) so far. Can that be? Anyone else do the test?
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  #55  
Old 08-05-2015, 11:34 AM
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mach4, have you (or anyone else) determined where the seal on the oil cooler T stat is against the housing? I think (from what I can determine so far), the seal surface is at the outer diameter (outside of the 4 holes) of the second piece from the left in this pic. Do you agree or disagree?
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  #56  
Old 08-05-2015, 11:55 AM
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Originally Posted by funola View Post
mach4, have you (or anyone else) determined where the seal on the oil cooler T stat is against the housing? I think (from what I can determine so far), the seal surface is at the outer diameter (outside of the 4 holes) of the second piece from the left in this pic. Do you agree or disagree?
I would agree with that assessment.
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  #57  
Old 08-05-2015, 11:58 AM
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For the time being I have the oil cooler blocked off with a sheet of aluminum. The temps seem to run about 10-15 degrees warmer, but still haven't seen 212, though yesterday I did register 200 briefly.
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  #58  
Old 08-05-2015, 12:03 PM
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Originally Posted by mach4 View Post
I would agree with that assessment.
Then those 4 holes would allow oil to flow to the oil cooler even with thermostat fully closed. Something is not right.
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  #59  
Old 08-05-2015, 12:09 PM
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I assembled the thermostat (with center pin removed=stat fully closed), leaving out the check valve and spring (2nd and 3rd piece from the right) and poured water into the open hole of the cap. Water flowed out of the both oil cooler ports immediately. WTF?

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  #60  
Old 08-06-2015, 11:39 AM
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Originally Posted by mach4 View Post
For the time being I have the oil cooler blocked off with a sheet of aluminum. The temps seem to run about 10-15 degrees warmer, but still haven't seen 212, though yesterday I did register 200 briefly.
I don't think it will ever reach 212F if your oil cooler warms up gradually as you reported. When are you going to replace the T stat?
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