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 Carburetor bottom base to middle section bolts 
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Joined: Sun Oct 23, 2016 10:02 am
Posts: 243
Location: Mesquite, NV
Post Carburetor bottom base to middle section bolts
Our carb rebuild came to a halt tonight. We couldn't get two of the bolts that attach the base to the middle sections out. The two we did get out were extremely difficult to remove. They look like they were heavily loctited. We're soaking the remaining two in PB Blaster tonight.

Any hints on getting these out and why it's so hard?

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1971 Pinzgauer M710, all stock including 245-16 Maloya tires, taken off and stored for show
BFG MT KM2 265/75R16's on Black SAV replacement rims on now


Thu Apr 13, 2017 8:07 pm
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Joined: Wed Apr 14, 2004 9:58 pm
Posts: 1401
Location: Idyllwild, CA
Post Re: Carburetor bottom base to middle section bolts
Dry them thoroughly (no fumes) then put them in a 250F oven for an hour. When good and hot, take them out and immediately try to remove the screws with a proper fitting screwdriver. They should come loose. If not then continue to try the PB Blaster.

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Jim M.
712W and 710M


Thu Apr 13, 2017 8:36 pm
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Joined: Sun Oct 23, 2016 10:02 am
Posts: 243
Location: Mesquite, NV
Post Re: Carburetor bottom base to middle section bolts
Thanks. When we put them back in, should we use loctite? Blue?

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1971 Pinzgauer M710, all stock including 245-16 Maloya tires, taken off and stored for show
BFG MT KM2 265/75R16's on Black SAV replacement rims on now


Thu Apr 13, 2017 8:49 pm
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Joined: Thu Oct 10, 2013 7:18 pm
Posts: 219
Location: Mt. Hope, Ont., Canada
Post Re: Carburetor bottom base to middle section bolts
I doubt the white mess on the screws is loctite. It looks like aluminum oxide created by electrolytic action between the screws' steel and the carb body's aluminum. They are stuck because rust (not iron oxide in this case but aluminum oxide) is a form of welding. It's likely those screws have never been removed since the carb was manufactured.

The heat idea is a great one. If it doesn't work at 250 try increasing it to 350 an then 450. The casting should handle the temperature with no issues.

Good luck!

Cheers, Clive


Fri Apr 14, 2017 7:37 am
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Joined: Sun Oct 23, 2016 10:02 am
Posts: 243
Location: Mesquite, NV
Post Re: Carburetor bottom base to middle section bolts
Thanks to both of you. This morning the PB Blaster was still sitting in a puddle on top of the bolt heads, so I doubt if it penetrated much.

Heating in the oven at 250F for an hour worked to separate the base from the upper section. But the bolts still didn't want to come out of the base section. So I heated up the base at 250F for an hour and tapped the bolts out using a punch on the end and they came out fine.

The two bolts in the picture are replacements. The two that were hard to get out are black and only threaded on the upper section end.

Great responses on this forum!

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1971 Pinzgauer M710, all stock including 245-16 Maloya tires, taken off and stored for show
BFG MT KM2 265/75R16's on Black SAV replacement rims on now


Fri Apr 14, 2017 11:42 am
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Joined: Wed Apr 14, 2004 9:58 pm
Posts: 1401
Location: Idyllwild, CA
Post Re: Carburetor bottom base to middle section bolts
The reason I suggested 250F is this temperature is not likely to do much, if any, damage to anything not metallic - plastic, O-rings, etc. You can always go hotter but often 250F is effective.

Our 710M was always loosing the top screws until we started using blue Locktite on them; others have had the lower bolts loosen until they did the same.

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Jim M.
712W and 710M


Fri Apr 14, 2017 12:00 pm
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Joined: Sun Oct 23, 2016 10:02 am
Posts: 243
Location: Mesquite, NV
Post Re: Carburetor bottom base to middle section bolts
We did the same 250F for 1 hour on the front carb base bolts, worked well on it too. Great input!

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1971 Pinzgauer M710, all stock including 245-16 Maloya tires, taken off and stored for show
BFG MT KM2 265/75R16's on Black SAV replacement rims on now


Sat Apr 15, 2017 8:42 pm
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Joined: Wed Jan 18, 2012 9:07 am
Posts: 237
Location: Vienna, Austria
Post Re: Carburetor bottom base to middle section bolts
I swapped these screws for DIN 7984 low head inbus screws M6 x 40 mm.
Image
Makes life much easier next time ...

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Cheers
Albert
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My Pinz has NEVER been with any army


Wed Apr 19, 2017 4:19 am
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Joined: Sun Oct 23, 2016 10:02 am
Posts: 243
Location: Mesquite, NV
Post Re: Carburetor bottom base to middle section bolts
We used Loctite Blue when re-installing the bottom bolts about 3 weeks ago. We had to separate the bottom again yesterday to install new accelerator pump valves, and the bolts cracked open pretty easily with the Loctite Blue. So I think the original problem was corrosion.

BTW, I had ordered new bottom bolts and lock washers from SAV since the screwdriver slots on ours were starting to wear a little. I received 8 shoulder bolts, but each carb only uses 2 shoulder bolts for positioning. The shoulder bolts won't go into the other two holes. The washers that SAV sent were too small for the shoulder bolts so I had to re-use the old ones. The washers SAV sent fit fine on the non-shoulder bolts that I had to re-use. A heads up when ordering new bottom bolts and washers.

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1971 Pinzgauer M710, all stock including 245-16 Maloya tires, taken off and stored for show
BFG MT KM2 265/75R16's on Black SAV replacement rims on now


Wed May 03, 2017 9:53 pm
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