Engine/Transmission (1998.5 - 2002) EGR probe install question

[Schlickenmeyer]

I was told there is more than one kind of tap, Which kind do I need to install the probe in my manifold? The engine just ate the #5 conrod bearing, and the manifold will be on the shop floor for a week while they order the new crankshaft (#2 in 2000 miles). I will have to do this quick, and can't risk screwing it up.



Thanks!

 

[nps]

Think you mean EGT?



There are two common sizes for probes, but they are either one size or the other. Most common is 1/4" NPT. Less common is 1/8" NPT. Both are pipe thread taps. I know most HW stores stock the 1/4" NPT. I couldn't find a 1/8", but the larger hole is better if you install it on the truck and don't take off the turbo (more room to get shavings out).

 

[JEastbourn]

I just installed an autometer ultralite pyrometer with a type K thermocouple last week. I used a 5/16 drill bit just ahead of the turbo and tapped it with an 1/8" pipe thread tap with a thread pitch of 27. The tap and die kit I had had several different thread pitches for a 1/8 tap. Just make sure the tap and your probe have the same pitch. I also drilled the hole with the truck at idle and all the shavings blew out of the hole with no problem and when I tapped the hole (with truck off) I used lots of grease on the tap and then just a small pocket extenable magnet to fish out any fillings left in the manifold. Hope this helps.

 

[Schlickenmeyer]

Thanks for the quick replies. I am almost sure mine is 1/4".

I just wanted to get the right tap, from what I have read on here, I do not want to tap all the way through. And the manifold will be off the truck for a week, so I really want to do it now.

I will grab the probe and take it with to the hardware store to be sure. I like the idea of the pilot hole too. .

 

[nps]

The tap will specify what size hole to drill. A pipe thread tap is tapered, so NO - do not tap all the way through. You want to run the tap in a couple of turns, then thread in your adapter to check the fit - you want the bottom of the probe adapter to sit flush with the inside wall of the ex manifold. Leave about 1 turn from the bottom when fitting it by hand to allow you to snug it up on the final installation. You may also want to get a plug to put in the manifold so there isn't a hole in it when the engine is put back together (unless you are going to leave the probe with the shop).

 

[rivercat]

When I did mine a drilled slowly almost all the way through then started the truck and let the D/P push the chips out while I drilled all the way through. Then tap with lots of grease on the tap to hold the chips. Then take a pen magnet and sweep for remaning chips in the hole.

 

[Schlickenmeyer]

Ok, I will give that a try. As it turns out, the manifold will not be off the truck.

Pulled the head, but left it on. They say I spun the #5 conrod bearing. another new crank. this one had about 1500 miles on it. They won't even get me a car.

The last dollar chrysler EVER sees from me.