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  #1  
Old 06-07-2020, 08:16 AM
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Is 100 C degrees normal for 1991 350sd?

looking at 1991 350sd-- driving around town - temp reached hair over 100 C
ambient temp--94 F

My 300sd --80-82 C
My e320cdi-- 90 C

this 350sd-- seemed little high
Also- crude blow by test-- Not much smoke or Cap dance... BUT- lot's oil jumping out in couple seconds with cap off...

any thoughts-

thx

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  #2  
Old 06-07-2020, 11:41 AM
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Probably needs a fan clutch if it's that hot in town. 603's in 126 chassis will stay dead-center of the gauge unless pulling up a long, steep hill (and they'll drop right back down afterwards).

Oil throwing out is from the camshaft. It's normal.
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  #3  
Old 06-07-2020, 11:52 AM
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Quote:
Originally Posted by Diseasel300 View Post
Probably needs a fan clutch if it's that hot in town. 603's in 126 chassis will stay dead-center of the gauge unless pulling up a long, steep hill (and they'll drop right back down afterwards).

Oil throwing out is from the camshaft. It's normal.
So running at 100... wouldn't necessarily mean "rodbender"?

what are the "Tells" of Oil consumption/Rod bending? w/o benefits of Driving for several days?

Basically- too far away... so Owner shot few 10 second videos ...

I don't want to fly 1000 miles -- and be really disappointed...
Only records w/ Motor- from MB- was in 1997 car had some valve stems replaced
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  #4  
Old 06-08-2020, 02:23 AM
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My 350 is 82 or so in all but hot temperature traffic with the ac blasting. It will creep up towards 100 then. But start moving and it’s solid at a bit above the 80 mark.
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  #5  
Old 06-08-2020, 11:55 AM
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Quote:
Originally Posted by wallbenz View Post
looking at 1991 350sd-- driving around town - temp reached hair over 100 C
ambient temp--94 F

My 300sd --80-82 C
My e320cdi-- 90 C

this 350sd-- seemed little high
Also- crude blow by test-- Not much smoke or Cap dance... BUT- lot's oil jumping out in couple seconds with cap off...

any thoughts-

thx
Yes it is normal with a completely stock cooling system in hot weather. There are way reduce this "normal" on the om603 with a smaller water pump pulley, colder Tstat, electric fans etc. Mine never exceeds 90c.
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Old 06-08-2020, 01:13 PM
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Originally Posted by tjts1 View Post
Yes it is normal with a completely stock cooling system in hot weather. There are way reduce this "normal" on the om603 with a smaller water pump pulley, colder Tstat, electric fans etc. Mine never exceeds 90c.
The 350SD/SDL already has all of the upgrades available from the factory (dual aux fans, small water pump pulley, HVAC controlled aux fan, etc). The W126 chassis has a large vertical flow radiator and doesn't suffer from the same cooling issues that the W124 does.

Living in a HOT climate and with plenty of hills around, that car should sit with the needle dead-center of the gauge (~85-90˚) at all times unless pulling up a very long, steep hill in hot weather.
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Old 06-08-2020, 07:40 PM
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Originally Posted by Diseasel300 View Post
...that car should sit with the needle dead-center of the gauge (~85-90˚) at all times unless pulling up a very long, steep hill in hot weather.

My guess, time for a radiator.
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  #8  
Old 06-08-2020, 07:57 PM
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Originally Posted by GregMN View Post
My guess, time for a radiator.
Guess again. The thermal behavior of the 603's is very well documented. Elevated temperature when under heavy load in very hot weather is normal for them. Temp should drop immediately when the load is reduced. The thermostat design leaves a bit to be desired with response to large changes in load.
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  #9  
Old 06-09-2020, 11:08 AM
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Originally Posted by Diseasel300 View Post
The 350SD/SDL already has all of the upgrades available from the factory (dual aux fans, small water pump pulley, HVAC controlled aux fan, etc). The W126 chassis has a large vertical flow radiator and doesn't suffer from the same cooling issues that the W124 does.

Living in a HOT climate and with plenty of hills around, that car should sit with the needle dead-center of the gauge (~85-90˚) at all times unless pulling up a very long, steep hill in hot weather.
No it doesn't.
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  #10  
Old 06-09-2020, 11:56 AM
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Quote:
Originally Posted by JHZR2 View Post
My 350 is 82 or so in all but hot temperature traffic with the ac blasting. It will creep up towards 100 then. But start moving and itís solid at a bit above the 80 mark.

Mine is a little below 100 but has moved to 100 after extended traffic jams.
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  #11  
Old 06-09-2020, 12:05 PM
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Originally Posted by tjts1 View Post
No it doesn't.
Yes it does.
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  #12  
Old 06-09-2020, 01:03 PM
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Quote:
Originally Posted by wallbenz View Post
looking at 1991 350sd-- driving around town - temp reached hair over 100 C
ambient temp--94 F
any thoughts-
After 11 posts it seems in order to suggest that the temperature rating of the installed thermostat be determined, and then that the actual opening of the thermostat be assured. In other words, remove, examine, and test.
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  #13  
Old 06-09-2020, 01:26 PM
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Checking the fan clutch would be a good idea.

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