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Old 05-02-2005, 09:07 AM   #1 (permalink)
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Drilling for Pyrometer

Did you remove your exhaust manifold?

I am getting ready to install an EGT gauge and my assumption was that I had to remove the manifold to ensure that no chips made their way to the turbo; but now i have read a couple of installation articles that don't remove it Seems to me you are asking for trouble by not taking the time to take it off.

Is it better to have the pyrometer on the cast housing or weld a bung on the pipe going to the turbo?

Thanks
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Old 05-02-2005, 09:10 AM   #2 (permalink)
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i didnt remove mine. just greased the drill bit and tap and cleaned and regreased a lot.
then ran a magnet around the hole for a while to get the big chunks.
that was like 20,000 miles ago and no problems so far.

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Old 05-02-2005, 09:30 AM   #3 (permalink)
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if you are super anal you can remove the exhaust manifold, but honestly there is no good reason to. If you take out the chips while you're drilling and pause before you break all the way through and clean out everything you're only going to have a couple little chips and the second that you start the engine it's going to blow them all out through the turbo. The miniscule amount of metal shavings that goes through the turbo isn't going to hurt it.

As for where to put the pyro the closer to the engine the more accurate the temperatures. However the difference between putting it on the manifold (that's where I have mine) and putting it on the pipe to the turbo probably won't be very large.

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Old 05-02-2005, 09:39 AM   #4 (permalink)
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Quote:
Originally Posted by derek
i didnt remove mine. just greased the drill bit and tap and cleaned and regreased a lot.
then ran a magnet around the hole for a while to get the big chunks.
that was like 20,000 miles ago and no problems so far.

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Old 05-02-2005, 10:23 AM   #5 (permalink)
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I have read that leaving the motor running while you drill and tap is the way to do it, unless you remove the manifold.
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Old 05-02-2005, 10:45 AM   #6 (permalink)
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I dont know about leaving it running but I greased, drilled, regreased, finished and inspected then tapped slowly. Its been fine for 10K miles. I have read that post and pre temps differ by about 200 degrees depending on the post location. FYI.
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Old 05-02-2005, 03:59 PM   #7 (permalink)
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I just left the motor running and used grease on the bit with no problems. be sure to wear some safety glasses if you do it while running.
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Old 05-02-2005, 04:54 PM   #8 (permalink)
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i just did mine this past weekend and i started with a greased 5/32 bit then a greased 5/16 bit and ended with a greased 7/16 bit and greased the tap up really good. then i just fired it up and the turbo is still spinning
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Old 05-02-2005, 07:29 PM   #9 (permalink)
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I drilled mine until I almost broke through, cranked it up and finished drilling and it blew all the chips out. I then greased the tap and finished it up. I did regrease it twice. Had no problems so far and dont plan on any either!!

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Old 05-02-2005, 07:58 PM   #10 (permalink)
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I guess that makes me one of the anal retentive type. I pulled the turbo off pushed it over after loosening the down pipe, cleaned it out. Only takes a little longer. Stuff a rag past the drill point, vacume out pull rag, send a magnet down just to make sure.
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Old 05-03-2005, 07:14 AM   #11 (permalink)
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4 bolts, loosten the turbo enough to slip some cardboard/posterboard or something in there and then vacuum the shavings out when your done.

Not that much extra effort to be safe.
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Old 05-03-2005, 09:02 AM   #12 (permalink)
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I just ordered the gauges from John at Diesel Performance Shops and he confirmed that he leaves the engine running while drilling the manifold. The 20 or so psi of pressure pushes any chips out as you are drilling. He also sent a picture showing where to drill for a boost gauge on an LLY Duramax. Great guy to deal with.
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Old 05-03-2005, 08:13 PM   #13 (permalink)
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Used grease on drill bit and tap last weekend. used magnet to clean up any leftover chips. no problems
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Old 05-03-2005, 10:15 PM   #14 (permalink)
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Ditto, just use the oil and magnet.
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Old 05-04-2005, 06:23 AM   #15 (permalink)
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Could hold a shop vac there while you're drilling. I'd still crack the bolts on the turbo and put the paper or cardboard in there as mentioned.
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Old 05-04-2005, 09:20 PM   #16 (permalink)
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Quote:
Originally Posted by weedwacker
I guess that makes me one of the anal retentive type. I pulled the turbo off pushed it over after loosening the down pipe, cleaned it out. Only takes a little longer. Stuff a rag past the drill point, vacume out pull rag, send a magnet down just to make sure.
Exactly what I did. I'm ususally the better safe than sorry type.
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Old 05-06-2005, 06:18 PM   #17 (permalink)
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when i did mine .. my wife controoled the shop -vac while i driller .. and just before i broke through i duct tapped my tailpipe and quickley started the truck and proceed to drill .. i am telling you i had a blast of exhaust through that hole !!! i am sure and filling came out !! simple stuff !!!!

Good luck
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Old 05-07-2005, 10:10 PM   #18 (permalink)
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I magnatized the drill bit, then put a shop vac on the whole. Then tapped it with grease, shop vac again. Just to be safe I magnatized a small allen key and swished it around in the whole till there were no more shavings. I've done it on 3 different trucks. No problems.
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Old 05-08-2005, 06:17 AM   #19 (permalink)
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Quote:
Originally Posted by Oxjockey
Could hold a shop vac there while you're drilling. I'd still crack the bolts on the turbo and put the paper or cardboard in there as mentioned.

Well, cracking the turbo bolts on my 1998 truck with almost 300,000 miles on them looked like potentially more trouble than it would be worth.
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Old 05-08-2005, 07:06 AM   #20 (permalink)
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Quote:
Originally Posted by DRM
Well, cracking the turbo bolts on my 1998 truck with almost 300,000 miles on them looked like potentially more trouble than it would be worth.
3 days of pb blaster should do the trick
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Old 05-11-2005, 11:45 AM   #21 (permalink)
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just did mine last night, lots of greese, and the Edge instructions, say to start the motor right after you drill and let it run for 15 to 30 secs.
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