Yeah, you can swap the DV's around, they are all the same. I've never pulled one apart, so watch out for flying springs.

I'm baffled at this point, too. When you ran the valves, were any of them way out like you might have a cam lobe going flat? You know the cylinders all hold air, do you have access to a compression tester just to verify that all 6 holes have good compression?

 

Flat cams! That takes me back to my old 283 cheby days. The cams were only case hardened and when that wore through the lobe went flat quick! Lucky that good used cams were so cheap.

What's a DV?

 

Delivery valve. That's what the injector lines attach to on the back of the pump.

 

Is that like a check valve? If so then it would sure let the fuel leak back so it took a bit more stroke to pop the injectors at idle IMHO. Believe it or not the lines do have a little spring to them so they would maintain some pressure between pulses assuming of course I am correct in my assumption the DV is a check valve. If not then never mind.

Edwin

 

Not exactly.

 

A good and quick way to check to see if a lobe is going out is look at the rocker arm nut. All rocker adjusting screws should have about the same amount of theads above the nut. If one is barely getting a full nut, then I would suspect a lobe going down.

Off topic here, but, ISC engines are very bad about cam lobe failures. The first thing that you will find is a push tube off of the rocker. You can adjust it and barely be able to get a full nut on the adjusting screw. Usually after 30 minutes of normal driving, the lobe will wear down even more and cause the push tube to come off of the rocker arm seat.

If you look at this picture, you will see 2 delivery valve setups. The one on the left is from our engines the one on the right is from an industrial version. (Dont get any wild hairs about going to an industrial style as it has already been tried, LOL) anyway, the one on the left is what you will find if you take the valve apart.

 

Ok ill try switching DVs first since I dont have a comp. tester. and as far as I can tell all the rocker screws look about the same. and my valves seem to stay ok. last summer I had 1 that was way out, not sure which one anymore.I also checked the push tubes to see if any were bent and all looked good.

#1 so now I need to ask ..If I pull the DVs do I need to put a sealer on the threads at the pump end??

#2 will a cracked flex plat cause the shake? but the exhaust sounds like a miss in it.The D350 is a 90 auto also and I dont seem to hear it on that one but its got a stock turbo and stacks and this one has an HTT hybrid and 3.5" strait pipe

#3 who sells a inexpensive diesel comp tester?

Sorry for all the ?s I just hate it when things dont run right

 

1: Don't know, never pulled them. If you use anything it would be a small amount of pipe dope, never use tape.
2: I've never heard of a flex plate making a shake. They always seem to make a nasty knocking noise that scares the crap out of the unfortunate owner.
3: I've seen 'em in the Harbor Freight catalog. DO NOT try a wet compression test like on a gasser. A diesel can fire on the oil, which will do bad things to the gauge.

Keep your chin up, you'll get it figured out. I really don't think it's in the bottom end.

 

Just an anecdote on the shake. I once had 350 cheby drop a valve so I had a guy rebuild a 400 and drop it in ahead of the auto tranny.

It shook real bad when I got it back but since I was out in BF Egypt I was in a hurry to get home.

When I started looking for the source of the shake I noticed the idiot had aparently lost one of the three bolts which mate the TC to the flex plate and the bolt he used was to long and had dented the TC some. I got the proper bolt from a dealer and installed it but still it shook.

So then I thought perhaps the TC bushing in the tranny had been damaged so I dropped the tranny and had the bushing and the TC replaced. It still shook.

I resigned myself to live with it because otherwise it ran great.

About a year later the harmonic balancer fell off the front of the engine and tore up the crank some. There was supposed to be a big bolt to hold it in which was also missing. After I fixed the dings in the crank and bought a new HB and added the bolt no more shake!

I remembered that when I looked at the engine before he overhauled it it had been sitting on his shop floor and resting on the HB and IT WAS CRACKED!

I'm only telling this to remind you to not overlook the obvious and I like telling stories.

Edwin

 

Thanks guys, your alot of help and funny too. its raining today and I have no room to work in the shop so ill prolly hit this monday .I have some locktight tread sealer if I need to use it in on the DVs(just incase)and ill need to look through my latest edd. of HF to see if I can get a comp, tester . if all else fails, if it don't quit raining I will start building an ark.and put my Dodges in 2 by 2.

Edwin..I will try your idea about the harmonic balancer and will pull the one off the D350 and see if it helps.cant hurt. at this point its a game of hide and seek

 

I'd try the DV first since it's easier. If you've really got a miss then it's probably not the HB.

Edwin

 

I agree the HB will be later