1995 e300d 181,000

Picked up t-stat housing and t-stat from the dealer. While sitting at a red light I was dry-fitting the parts. O-ring didn't fit tight in the housing. There was lots of slack. I think I got the wrong t-stat. Can anyone confirm the p.n. for me? Here's what I bought:
601-200-00-15 - tstat (came with a new o-ring)
603-203-04-74 - tstat housing

I have the shop guide pic and it doesn't show an additional gasket or o-ring. Just the tstat, tstat oring and tstat housing. Thanks all.

I have the 617, so I can't be of help.

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RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K

90 Dodge D250 5.9 Cummins/5 speed. 400K

I want to have the parts on hand while I'm into the job. I don't want to stop what I'm doing. Seems to me that the o-ring should fit snugly in the housing lip. Right? The o-ring fits nicely around the tstat. This is my first time changing this one so I'm a little unsure how the pieces fit.

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I've only changed the t-stat on a 617, but it sure looks like it uses the same gasket, which is not an o-ring.

You know the kind I'm referring to?

When I went to Napa Auto, they gave me a t-stat with an o-ring like the one your photo shows. When I went to the MB dealership they gave me the same t-stat, but the proper gasket.

This is what it should look like (part can be found in Fast Lane):

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-justin

1987 300TD, 1987 300TD
2008 R32, 2000 Passat Wagon

Fastlane has the right part. The MB dealer didn't. Huh. Go figure. I guess I'm a dumbass for expecting one of the largest MB dealers in the Washington metropolitan area to know what they're doing.

I would have bought the part at Phil in the first place, but I also need the tstat housing - a dealer part.

I ordered a part for my 201. Wrong. 2nd time, still wrong, 3rd time's the charm? Nope. 4th time they got it. All the time, the parts were different. However, the bag they came in was labeled correctly. IOW, going off the parts bag, it was right. Label on the bag however did not match the number stamped on the part itself.

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01 Ford Excursion Powerstroke
99 E300 Turbodiesel
91 Vette with 383 motor
05 Polaris Sportsman 800 EFI
06 Polaris Sportsman 500 EFI
03 SeaDoo GTX SC Red
03 SeaDoo GTX SC Yellow
04 Tailgator 21 ft Toy Hauler
11 Harley Davidson 883 SuperLow

You usually need to hold their hands when they're looking up parts, but they're in there somewhere.

__________________
-justin

1987 300TD, 1987 300TD
2008 R32, 2000 Passat Wagon

No, I have WIS and EPC. I tell them what I want.

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01 Ford Excursion Powerstroke
99 E300 Turbodiesel
91 Vette with 383 motor
05 Polaris Sportsman 800 EFI
06 Polaris Sportsman 500 EFI
03 SeaDoo GTX SC Red
03 SeaDoo GTX SC Yellow
04 Tailgator 21 ft Toy Hauler
11 Harley Davidson 883 SuperLow

connerm, the picture posted by justinperkins is correct. (I just changed the thermostat on my 606.) As I'm sure you've figured out from the pic, the seal ring goes on the thermostat first, then slip it into the housing. In your photo, note the protrusion inside the housing, which lines up with an indentation in the thermostat.

I found it impossible to fit the thermostat back into the engine-side housing if I had it in the outer housing. Better to hold the two parts in approximate alignment, put the thermostat into the engine-side housing, then slip on the outer housing. Torque bolts only to 10 Nm.

Thanks pjc. I didn't realize the torque value was so low. 10 nm isn't a lot. Thanks again.

Steel bolt into aluminum housing. Easy to strip, so these combinations always tend to be 10-15 Nm, 20 tops.

Oh the joy of stripping threads. Once bought a 1980 KZ1000 MKII with a stripped out sparkplug hole. Threadsert fixed that. Would you suggest anything on the bolt threads? Antisieze? Red or blue Locktite?

no way, you want to be able to easily get those bolts out. they're not going to come unthreaded. just snug them up and be done with it.

__________________
-justin

1987 300TD, 1987 300TD
2008 R32, 2000 Passat Wagon