How to remove engine - weird mounts? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

davepl · 02-14-2012, 02:41 PM

My 1970 GMC 402 has mounts that I've never run across in a passenger car. Normally when I pull the motor there is a long horizontal bolt that runs through the mount, but this doesn't have that.

The mount bolts to the chassis stand with a single big bolt that runs through the stand -towards- the engine; unfortunately that bolt head is 'protected' with metal tabs that are tough to bend away.

The shop manual doesn't show these locks on the V8, and it shows the stands as riveted in (mine appear bolted).

I could alternatively remove the stands with the motor, but they're not that easy to get at either (by myself, anyway, since they're a nut-bolt combo).

Anyone familiar with this style of mount, and know the best way to get the engine out?

Thanks!
Dave

71swb4x4 · 02-14-2012, 03:06 PM

I am not sure how BB mounts work. The mount you describe first is how all of the mounts I have seen are, but I have not messed with a BB. Are you sure that the bolt isn't simply missing? Maybe the bolt is gone and you can pull it out as it is.

**too much stuff** · 02-14-2012, 03:07 PM

You have the 68-71 big block stands. Through the center of the stand there should be a bolt that passes through from behind. I think it is 11/16 or 3/4 maybe.

**Classic Bowties** · 02-14-2012, 03:37 PM

Quote:

Originally Posted by davepl

Anyone familiar with this style of mount, and know the best way to get the engine out?

Thanks!
Dave

Have a look at the below diagram, going to have to get in there and bend the flats of the locking tabs away from the bolt head to remove the bolts. Mel

cdowns · 02-14-2012, 04:38 PM

i've always just removed the engines with the engine stands attached and then dealt with removing the engine mounts

**tkeduk8r** · 02-14-2012, 04:47 PM

Agree with cdowns.... PITA trying to take them out in the truck...
--Mike

davepl · 02-14-2012, 05:58 PM

Thanks, that's what it looked like to me. I'll run out and try to pull it with the stands still attached and then deal with them later.

davepl · 02-14-2012, 08:26 PM

For future visitors to this thread, I hoisted the engine after unbolting the stands from the frame, then while it was on the hoist (be careful, never work under a suspended engine) zipped them off easily.

02-14-2012, 02:41 PM	#1
davepl Registered User Join Date: Aug 2006 Location: Redmond, WA Posts: 6,334	How to remove engine - weird mounts? My 1970 GMC 402 has mounts that I've never run across in a passenger car. Normally when I pull the motor there is a long horizontal bolt that runs through the mount, but this doesn't have that. The mount bolts to the chassis stand with a single big bolt that runs through the stand -towards- the engine; unfortunately that bolt head is 'protected' with metal tabs that are tough to bend away. The shop manual doesn't show these locks on the V8, and it shows the stands as riveted in (mine appear bolted). I could alternatively remove the stands with the motor, but they're not that easy to get at either (by myself, anyway, since they're a nut-bolt combo). Anyone familiar with this style of mount, and know the best way to get the engine out? Thanks! Dave

02-14-2012, 03:06 PM	#2
71swb4x4 Senior Member Join Date: Nov 2003 Location: Brookings, SD Posts: 10,497	Re: How to remove engine - weird mounts? I am not sure how BB mounts work. The mount you describe first is how all of the mounts I have seen are, but I have not messed with a BB. Are you sure that the bolt isn't simply missing? Maybe the bolt is gone and you can pull it out as it is. __________________ Some people are like slinkies, they aren't good for anything, but you can't help but smile when you see one tumble down the stairs.

02-14-2012, 03:07 PM	#3
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,801	Re: How to remove engine - weird mounts? You have the 68-71 big block stands. Through the center of the stand there should be a bolt that passes through from behind. I think it is 11/16 or 3/4 maybe. __________________ 67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto

02-14-2012, 04:38 PM	#5
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: How to remove engine - weird mounts? i've always just removed the engines with the engine stands attached and then dealt with removing the engine mounts __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

02-14-2012, 04:47 PM	#6
tkeduk8r Senior Member Join Date: Apr 2001 Location: Alexandria, MN Posts: 1,462	Re: How to remove engine - weird mounts? Agree with cdowns.... PITA trying to take them out in the truck... --Mike __________________ 63 C20 2WD, 230/SM420/4.11 73K 68 C30 dump truck, 327,SM425,4.56 66K original 68 C10 2WD SWB Stepper, 250/3-tree/3.73 66K.... Wifes 68 Buick Skylark Custom Conv., 350/TH400/2.56 In our family since '79 69 GMC 1500 SWB 2WD, 350/TH350/3.73 posi... 70 K10 SWB 4X4 4-sp,ps, pb, tilt, buckets, console, sliding back window (Need AC parts) WIP 72 Chevy K20 4x4 350/350/205/4.56 donor 72 Vette 350/M21/3.70 posi, triple black and super fast 84 Olds Cutlass Brougham 350/2004r/4.11 was Dad's

02-14-2012, 05:58 PM	#7
davepl Registered User Join Date: Aug 2006 Location: Redmond, WA Posts: 6,334	Re: How to remove engine - weird mounts? Thanks, that's what it looked like to me. I'll run out and try to pull it with the stands still attached and then deal with them later.

02-14-2012, 08:26 PM	#8
davepl Registered User Join Date: Aug 2006 Location: Redmond, WA Posts: 6,334	Re: How to remove engine - weird mounts? For future visitors to this thread, I hoisted the engine after unbolting the stands from the frame, then while it was on the hoist (be careful, never work under a suspended engine) zipped them off easily.



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