I have truck with an 82' J code engine in it and I've found that the IP that is
on it is different from what should be there. The IP application list I have along with a call to Diesel Injection Service in Louisvilla, tells me I should have a 4153 pump on my engine. What I have ia a 4502 pump which should be for an 84-87 6.2L Light Duty Pick-up. Can anyone tell me if this difference in the IP would affect the operation of
the engine and if so, how?

Second, there is a round bakealite device mounted on the right side near the
rear of the pump with some wires coming out of it that go nowhere. Can someone
tell me what that pup is, what is it supposed to do and does it need to be there
for my engine?

Thanks

I don’t know about what IP pump you should have but your plastic device with wires sounds like the throttle position switch. It is really two switches in one. One was to control the pollution stuff that was on the engine, mainly an EGR valve. The other one was/is to control the lock up torque converter in the 400R automatic transmission. The switch was set to enable the lock on the torque converter when ever the throttle was opened past 10 degrees.
You do not need the pollution junk. If you have a manual transmission, you don’t need the other one either. I had so much trouble with mine, I finally took it out and built myself one, from microwave oven parts, that is inside the cab in a cleaner environment. It has been working for years.

Thanks for the information on the throttle position switch. I have a manual trans. so I guess I can remove the thing if I wish. Probably will because I hate having stuff on there that serves no purpose.

Hopefully there is an IP guru out there somewhere that can shed light on the IP question.


Thanks

No IP experts here?

You might try posting in 6.5l diesels engines . There are some sharp guys watching post

4502 is a better pump and has undoubtedly been replaced/updated at some time. Stanadyne made a lot of changes after 82, 4126/4153 pumps are pretty much scuds, nobody sells them anymore hardly. 4502 is still LD spec, but its only 4ccs less than HD and timing is a little slower to come in. Won't hurt a thing at all on your 82. Is the 'bakelite' connector between the pump and an injector line? If thats what your talking about its a connector for a Time Track or other tool to set your timing.

Thanks Texas Diesel, I was just about to change out the 4502 pump for a 4153 that I happen to have. You saved me some work.

Could you please expand a little bit on what you said.
I assume from what you said, light duty pumps put out less fuel to the injectors than the heavy duty pumps?

If the timing is a little slower, should I run the pump advanced? Right now I have it approx. the width of the mark advanced but had been thinking I would go a little farther when the pump model number came in question.

The bakealite device is approx. 1.5" to 2" in dia. and about .75" thick. It appears to be mounted centered on the throtttle shaft but on the right hand side if the pump and at the top of the lever that opperates the timing advance lever. Kinda looks like the choke on a pre-70's gasser and has electrical leads and plugs that don't connect to anything.

yeah, thats a tranny sender just as ag4gt described, has to be, but I don't recall seeing one like the one you describe.


LD pumps put up slightly less fuel than the HDs, and the advance is calibrated a little slower than the HDs. Static timing, position of the pump, should be advanced beyond the mark only to compensate for wear in the chain drive. I've seen trucks that would have to be set as far as they could be advanced to get the advance right. I'd say your lines width of advance is probably a little bit shy of where it should be, just try and give it about another lines width and see how she does. Its not an exact science, if your too too slow, you'll get white smoke and low power, if your too fast you'll get way too much detonation clatter and loss of power, so set it to where the truck seems to run the best, and maybe try 3 or 4 positions, making marks on the pump to keep track, and see where it runs best.

Thanks for the advice Texas Diesel. A little smoke is what I'm chasing right now. I will play around some more on the timing in between the farm chores. Part of my problem is that I don't really know what a 6.2 is supposed to sound or run like. I've been a 7.3 Navistar fellow for 16 years and use diesel tractors but the 6.2 is new to me. I won't even know if I have the hot and cold idle set right till we finish building the tach and get it installed.

One other question about the IP. If I were to get a rebuilt IP, which model number pump would you suggest I buy.