Working A Diesel Too Hard

[skyharborcowboy]

Without an Exhaust Temperature Gauge on these tractors how can you determine when you are putting too much of a load on an engine? I am specifically referring to my 656 but this would be a good general diesel question? If I were to install a EGT gauge on the pipe what temps would one expect to see?

Thanks,

Joe

 

[Anonymous-0]

I don't think that it needs an EGT unless you're running a really hot turbo. I don't think that IH put an pyrometer on tractors until later maybe on the 86 series. My dad runs an 756 german diesel on things he should use the 986 on and never has a problem with it running hot on the exhaust. It is also non turbo. My brothers 1256 has a stock turbo but no pyrometer on it and has no problems with it. I'm no tractor mechanic by any means but this is just my experiance. Just my 2 cents worth!

 

[Special Agent Dickweed]

No turbo exhaust temperature is no issue. The coolant temperature is the thing to watch

 

[Owen Aaland]

The load should be such that the engine is able to maintain rated speed most of the time. This will be about 200 - 300 RPM less than high idle speed.

For gear drive F & I 656D the speeds are:
High idle - 2050
Rated speed - 1850
Minimum overload speed - 1500.

For Hydrostatic drive F & I 656D the speeds are:
High idle - 2580
Rated speed - 2300
Minimum overload speed - 1600.

There are no specifications given for exhaust temperatures.

 

[Dave S.]

My brother had a 806 with M&W turbo installed and was told not to let the exhaust temp to get over 1250.

If you don't have a turbo or have a turbo but the fuel has not been turned up I don't think you will need a EGT gauge. But I am no expert either. The tractor vet would be the one to ask but he hasn't posted for some time

 

[Allan in NE]

Smoke/Sound

Allan

 

[Randy in NE]

If you are running a "stock" diesel you don't need to monitor the EGT. If you start to crank it up "excessively" you may want to think about it. I know a farmer with a 1466 (145 hp) that he has cranked up to around 250-300 hp and he doesn't have any problems with it. He would turn it up to closer to 400 hp for tractor pulling and never had any issues.

 

[Bob M]

Unless you’ve added a turbocharger then turned the pump way up, an exhaust pyro will not indicate if you’re overloading your 656.

Rather you need to watch the exhaust color. Once it becomes noticeably smoky the engine is giving all it can. Turning the fuel up further only makes more smoke (and depletes your fuel budget) – it won’t make any more power.

So instead keep an eye the water temperature and exhaust color. So long as temp stays in the “normal” range you are not smoking up the neighborhood you are not overloading the engine.

---

Incidentally I’ve never operated (nor even seen…) a non-turbo diesel with an exhaust pyro. So I don’t know what kind of max EGT’s are typical for a naturally aspirated diesel under full load. I’d guess however somewhere around 900 deg - maybe even less.

 

[Jim Allen]

Interesting topic! I have an extra pyrometer laying around and
have toyed with the idea of installing it onto my D358 (826). Not
that I think it's all that necessary. After many years of driving
diesel pickups in towing situations, both NA and turbo, that had
pyrometers, I can correlate high EGTs to what the exhaust looks
like. On an open station tractor the exhaust is kinda in your
face... if not literally in your face! If you are rolling lots of
smoke, your EGTs will be high. On my NA pickups, I found that
if the pump was even slightly turned up, you could get EGTs into
the terminal area pretty easily from overfueling and lugging. You
could do it on a stock truck if you tried hard enough. The
answer, of course was to either back off on the throttle or drop
down a gear and get the rpms up... but all-a-ya already know
that. I'm just interested to see it translates into the tractor world,
so maybe I ought to just do it and see for myself.

 

[mkirsch]

On a stock engine, especially one that's got some time on it, you're going to run out of power long before you overload it to the point of doing damage to the engine.

 

[Anonymous-0]

i bought my 806 new 9-11 67, put on a m&w turbo, 2yrs later,, the pyrometer came first in the mail, we had a small rain so i put that on,, that tractor was running 1350 degress with out the turbo, a week later the turbo kit came in,a friend came over, we put the turbo on,, went on in the field with the same load on it run about 1100 -1200 degress.. sounded better, less smoke,and it never says no. I, still have the tractor. Fullerton North Dakota,