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All Other GM Diesels Discuss any other GM Diesel engines... 5.7l Olds, Chevette Diesel, or anything else that doesn't fit anywhere else...

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Old 04-08-2019, 05:11 PM   #1 (permalink)
upsmoker
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8G glow plug TOTAL DISASTER

Here`s my situation in a nutshell, (i`ll post the whole "nut" later)
I`ve got two broken tips in the pre chambers on a 82 Oldsmobile 5.7 .Micro injector heads

There is no way with swollen tips, to any degree, that the tips would pass through the openings on the cups. The cups must be removed. Here lies my question. has anyone ever REMOVED a cup without damaging it.

Thank you in advance

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Quote:
Originally Posted by Bigboytoys View Post
Weeeellll a 6.2 and 5.7 have 3 things in common, you put oil in the pan, antifreeze in the block and it burns diesel
Quote:
Originally Posted by Bigboytoys View Post
Dang it ... your making the quote wrong, 4 things 5.7's and 6.2's have in common, flex ring failures ....


Last edited by upsmoker; 04-08-2019 at 05:12 PM.
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Old 04-09-2019, 07:42 AM   #2 (permalink)
dieselolds
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In all the years using 8G plugs in those engines I only had one fail.Not much you can do but use a brass punch and hope for the best in getting the chambers out.

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1996 GMC Sierra ext.cab Z71....with new genuine GM 6.2 660 short block,4L80E/6.5TD cylinder heads,DS4 5521S,82' 6.2 rocker arms,acdelco TP1069/Racor 20S fuel filters,4" diamond eye exhaust,3.73 G80 locker,stanadyne 37818 injectors

1996 Chevy K1500 Z71.....with '99 6.5 506 goodwrench van engine,88-93 6.2 diesel Napa y-pipe,'87 700R4,acdelco TP630F/Racor 20S fuel filters,Bosch non-turbo injectors,stanadyne blue tag 5088

1993 Chevy K1500 Z71...with 97' 6.5 TD 506 block,82' 6.2 rocker arms,stanadyne 37818 injectors,stanadyne blue tag 4911,DSG girdle,reman 700R4,Banks boost/pyrometer gauges,acdelco TP1069/TP943 fuel filter system,4 diamond eye exhaust/2 piece crossover

2008 Mercedes Benz E320 3.0 V6 turbo diesel

2013 Volkswagen Passat 2.0 TDI
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Old 04-10-2019, 05:47 PM   #3 (permalink)
upsmoker
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Had time today so decided to experiment on the removal of the pre-cups. All went really well after I got the first one removed so I could see exactly what was in that dark hole. Took my time with the first one, tap tap tap, measure measure measure, tap tap tap, measure measure measure. You get the idea. After using different materials as a drift on the first one, after the first cup was out, and I saw it`s construction, and the relationship of the injector hole and the glow plug hole(both holes are 6mm) I took a 3/16th. punch, ground the face slightly concave. The 3/16th drift gave me just enough space in a 6mm bore to give the drift a slight tip which is needed. 5 minutes the other cups were out
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Quote:
Originally Posted by Bigboytoys View Post
Weeeellll a 6.2 and 5.7 have 3 things in common, you put oil in the pan, antifreeze in the block and it burns diesel
Quote:
Originally Posted by Bigboytoys View Post
Dang it ... your making the quote wrong, 4 things 5.7's and 6.2's have in common, flex ring failures ....

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Old 04-11-2019, 09:16 AM   #4 (permalink)
57diesel
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Looks like some quality parts there. I have never seen one fail like that even when I was trying.



FWIW I didn't notice any performance difference going to Bosch plugs in my 5.7's.
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Old 04-15-2019, 05:31 PM   #5 (permalink)
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Quote:
Originally Posted by dieselolds View Post
In all the years using 8G plugs in those engines I only had one fail.Not much you can do but use a brass punch and hope for the best in getting the chambers out.
You and me both. I`ve had them die, never bulge that much, or rupture !!
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Quote:
Originally Posted by Bigboytoys View Post
Weeeellll a 6.2 and 5.7 have 3 things in common, you put oil in the pan, antifreeze in the block and it burns diesel
Quote:
Originally Posted by Bigboytoys View Post
Dang it ... your making the quote wrong, 4 things 5.7's and 6.2's have in common, flex ring failures ....

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Old 04-15-2019, 05:59 PM   #6 (permalink)
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Quote:
Originally Posted by 57diesel View Post
Looks like some quality parts there. I have never seen one fail like that even when I was trying.



FWIW I didn't notice any performance difference going to Bosch plugs in my 5.7's.

Hard to believe it`s the plugs. I personally don`t know what to think. I`m too close to the situation to think anything but the worse.

This all started last december, I needed my truck, plugged it in for 5 or so hours, it was around 0 degrees, I never use the truck in the winter. Waited for the glow light to go off, started right up, after glow working fine, went in the house to let it warm up. Heard the cold idle circuit kick off, went out and the wait light was on!!! Truck was running fine, went got a load of firewood, unloaded and split the wood, turned the key to run, the wait light came on, then off in just a few seconds as it should, engine turned over too many times before starting. It always starts instantly. pulled 3 plugs that are easily accessible, all 3 dead but no bulging. Ordered new plugs and they all ruptured or bulged badly on first 4 to 5 second cycle. I installed a ford solenoid and momentary button before cycling. The only other thing I did was put stanadyne winter treatment in the tank because I had summer blend. I`ve drained the tank just in case
I`ve got a cigar box heaping full of old plugs from over the years, can`t get an 8G to do anything but die after about 15 seconds

I think since I have manual solenoid now I`m going to go 60G
scared to death of 8g`s now.like what was the last thing you ate before you got the flu? never eat it again

Did I over treat my fuel, bad batch of 8g`s (all8?)
wasn`t thinking of tearing down a 37 k engine for grins & giggles
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Quote:
Originally Posted by Bigboytoys View Post
Weeeellll a 6.2 and 5.7 have 3 things in common, you put oil in the pan, antifreeze in the block and it burns diesel
Quote:
Originally Posted by Bigboytoys View Post
Dang it ... your making the quote wrong, 4 things 5.7's and 6.2's have in common, flex ring failures ....

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Old 04-16-2019, 09:31 AM   #7 (permalink)
dieselolds
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Just a suggestion here but were the injection pump mounting nuts good and tight?Seen some 6.5 engines and heard of one 5.7 diesel with a loose injection pump and the pump timing was all over the place because of being loose.Were those 8G plugs USA made?They could be made almost anywhere nowadays.
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1996 GMC Sierra ext.cab Z71....with new genuine GM 6.2 660 short block,4L80E/6.5TD cylinder heads,DS4 5521S,82' 6.2 rocker arms,acdelco TP1069/Racor 20S fuel filters,4" diamond eye exhaust,3.73 G80 locker,stanadyne 37818 injectors

1996 Chevy K1500 Z71.....with '99 6.5 506 goodwrench van engine,88-93 6.2 diesel Napa y-pipe,'87 700R4,acdelco TP630F/Racor 20S fuel filters,Bosch non-turbo injectors,stanadyne blue tag 5088

1993 Chevy K1500 Z71...with 97' 6.5 TD 506 block,82' 6.2 rocker arms,stanadyne 37818 injectors,stanadyne blue tag 4911,DSG girdle,reman 700R4,Banks boost/pyrometer gauges,acdelco TP1069/TP943 fuel filter system,4 diamond eye exhaust/2 piece crossover

2008 Mercedes Benz E320 3.0 V6 turbo diesel

2013 Volkswagen Passat 2.0 TDI
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