Names of the main dodge parts

[pshonka]

I have a 1990 Dodge cummins 3/4 ton, 2 wheel drive, single cab LE model. What is the name for the cummins motor includings any alias. Also since I have a 5 speed manual, can I assume it's a 5 speed Getrag?



Is there a place I can found out the technical data such as the gear ratio's in the transmission and the differential.



I have 180,000 miles on it and it seems to have lost much power over the last 20,000 or so. I really only notice when pulling. My mechanic thinks the injector pump is going out. What type or model did this generation come with (VE?) I have had the head replaced with the newer replacement and of course new injectors (7mm to 5mm or ?)



I really like the setup, but was wondering if there is a way to make it even more effiecent. I get 24 - 26 mpg unloaded. thanks

 

[SRadke]

I'll try to answer some of your questions.



The model of your Cummins is 6BTA. There should be a metal data pate on the driver side of the gear cover near the front of the motor that will give you more specific information about it.



The 5-speed transmission that was used in 90 model pickups was a Getrag. The axle ratio you have should be listed in your truck options. I'm sorry I don't know if they are posted on the first gens but on second and third gens they are on a sticker on the underside of the hood near the latch. There is a good chart of ratios on the gear vendor site located here. Disregard the shaded numbers because they are the ratios that a gear vendor would give you.



You do have a VE pump on that model. When you suggest loss of power I immediately suspect the fuel filter. Has it been changed recently? Loss of fuel=loss of power.



I hope all this helps.



-Scott

 

[dpuckett]

pshonka,



The engine has been ID'ed as a 5. 9l turbodiesel, or Cummins. Cant think of too much else.

TRansmission is most likely a Getrag- there is a tag on the passenger side, toward the rear, plus I believe it is stamped into the side of the gear box somewhere.

Gear ratio should be on a tag on the left side of the bolt pattern on the rear diff cover, held in between two bolts. It will be on the lower row of letters and numbers, 3. 54 LS is a 3. 54 Limited Slip. 4. 10 would be an open 4. 10.

I'd check the valve adjustment before I touched the pump. If it was your pump heading south, I'd almost bet you'd see less than the 24-26 you're getting now. Is there any blue or white smoke? If not, I'd say your fuel system is fine.

Do you have a pyrometer and boost guage on your truck? If not, I believe the Pastor gives a 20 hp penalty.



Daniel

 

[BushWakr - RIP]

Hey there, ... . welcome to the asylumn, grab a chair and pull up to the table... this is your new home... .





Most of you info has been covered by the guys...

Your mileage tells me that the truck is running pretty good. You are running pretty lean too. That kind of mileage is usually a result of very conservative fuel settings. I'd bet that a much more "common" and honest mileage for these trucks is about 17-19 mpg U. S.

If you have a noticable loss of power then, as noted, check the fuel filter, air filter.

Have you run a good dose of fuel additive thru it lately?? If not, do a double dose of additive and see if that helps you overall performance. We are now, up in Canada anyway, getting winter fuel.

It is a poorer grade, results in lower rougher idle, more smoke, and slightly degraded performance.

If you have a later 1st gen head it is fitted for the 7mm injector bodies and not the 9mm that was in the earlier heads. This larger body left less metal/casting between valve seats and was prone to cracking under heavy/hard use. Did this reduction in performance happen about the time you did the head work???

If you are using the later model injectors with that head then you will notice a step down in performance because the non-intercooled trucks had the larger injectors than the new 1st Gens.

Right there is a possibility for your power loss.

Have you got any gauges??? Can you fill us in on a bit more detail like smoke, how much, when, etc.



Pastor Bob.



"... and I say unto thee, verily, thou doust smoke alot and block out the sky;

for I have laboured hard on thy behalf and you're choking the heck outta me here, so push off... . "

 

[Greenleaf]

. . :-laf :-laf :-laf. .

 

[JLEONARD]

. I get 24 - 26 mpg unloaded

I get that kind of mileage as well... . don't think we'll get any better than that!

Cummins is 6BTA

Technically, you have a 6BT... the engine is a 6 cylinder B series . . T meaning 'Turbocharged'. A means 'Aftercooled' which means the same as 'intercooled'. Starting in Jan 91 (mid 91 model year) the trucks are intercooled.

 

[Paychk]

Originally posted by SRadke

The model of your Cummins is 6BTA.

The 90 model didn't have the charge air cooler (inter-cooler or after-cooler) so the model designation for his motor would be 6BT. 6=cylinders, B=series, T=Turbocharger, A=aftercooler. Picky I know, but consider it trivia.

 

[Bob Beauchaine]

Pastor Bob



Yay tho I blocketh the sky with my CTD I also parteth the water with my heavenly power - if you can't see there is one of two things to think about 1 - you're too darn CLOSE - and 2 you need but follow the cloud to the promiced land of diesel fuel and POWER!Oo. Oo. Oo.



Bob

 

[SRadke]

The guys are right, it's a 6BT. I guess I should have read more closely. Those days without intercoolers seem so long ago.



-Scott