spark plugs and gremlins

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McCall Pinz
Posts: 554
Joined: Sun Mar 11, 2007 6:01 pm
Location: McCall, Idaho

spark plugs and gremlins

Post by McCall Pinz » Sun Jun 17, 2018 11:23 pm

I thought I'd post a quick note about the most frustrating, but also the easiest Pinzgauer repair yet.

My Pinz has been running poorly again since coming out of hibernation. I chased gremlins last year too. Last spring it was running on 3 cylinders for a few weeks and then magically fixed itself mid-summer and then magically went back to bad in the fall, then ran OK right up until snowfall. Fuel filter clear. Cutoff solenoids work. Fuel system seems OK. Bad gas? It ran well when I charged the batteries for a while... Hmmm. Low voltage? Electrical issues? Pinz SSI going bad? 2400 rpm module going bad?

Two weeks ago, after a long trip, the poor performance was unbearable and I wondered if I'd burned a valve on the trip- I pulled the plugs to see which cylinder was bad and found #3 plug was totally covered in carbon. The rest were great. 2 minutes with a steel brush and re-checking the gap on all plugs. Fire it up and it starts smoking and burning all the junk out of cylinder #3 and voila- 25% increase in horsepower!

I adjusted the valve lash the next day and one of the #3 valves was too loose- almost .300 mm instead .200 mm- if I remember right. Either the slightly large gap wasn't opening the exhaust valve enough OR I'll need to re-do the rings this winter. Either way, check the plugs every once in a while to get an eye inside your engines.
eat, sleep, Pinzgauer

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TechMOGogy
Canada
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Joined: Wed Feb 01, 2012 11:39 am
Location: Ontario, Canada

Re: spark plugs and gremlins

Post by TechMOGogy » Mon Jun 18, 2018 3:39 pm

Is there a guide for doing/checking the valves?
72 Pathfinder | 75 710M 2.7i | 94 350GDT | 96 350GDT Worker

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pcolette
United States of America
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Joined: Sun Dec 10, 2006 7:38 pm
Location: Southwest Wisconsin

Re: spark plugs and gremlins

Post by pcolette » Mon Jun 18, 2018 6:19 pm

These are the instructions that I've always followed with great success.
Valve Adjustment.pdf
(25.41 KiB) Downloaded 57 times
Thanks Jim L.!
Paul C.
_________
'73 Swiss 710M
'89 Puch 230GE
2002 MB G500 (For Sale)

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TechMOGogy
Canada
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Joined: Wed Feb 01, 2012 11:39 am
Location: Ontario, Canada

Re: spark plugs and gremlins

Post by TechMOGogy » Tue Jun 19, 2018 7:26 am

Thanks handy to have!
72 Pathfinder | 75 710M 2.7i | 94 350GDT | 96 350GDT Worker

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McCall Pinz
Posts: 554
Joined: Sun Mar 11, 2007 6:01 pm
Location: McCall, Idaho

Re: spark plugs and gremlins

Post by McCall Pinz » Thu Jun 21, 2018 1:17 pm

I used that same method. The hardest part is that SSI doesn't have a rotor per se and lining up a precise 180 degree timing mark is tricky. I had to eyeball across the case seam.
eat, sleep, Pinzgauer

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Hotzenplotz
Austria
Posts: 269
Joined: Wed Jan 18, 2012 9:07 am
Location: Vienna, Austria

Re: spark plugs and gremlins

Post by Hotzenplotz » Thu Jun 21, 2018 2:03 pm

There is no need to look at any indicator at the pulley or taking off any part of the ignition..
if you remove all valve covers you see the rockers move.
Cylinders 1 and 4 are a pair, as well as 2 and 3.
With outlet closing and intake opening on cyl 1 you adjust the valves on cylinder 4, and vice versa. the same goes for the other pair.
Cheers
Albert
========================
My Pinz has NEVER been with any army

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McCall Pinz
Posts: 554
Joined: Sun Mar 11, 2007 6:01 pm
Location: McCall, Idaho

Re: spark plugs and gremlins

Post by McCall Pinz » Thu Jun 21, 2018 2:53 pm

Yes, that's ultimately how to confirm it.
eat, sleep, Pinzgauer

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