motor mounts cracking - The 1947 - Present Chevrolet & GMC Truck Message Board Network

71chevylongbed · 07-14-2004, 01:47 AM

the motor mounts were replaces last august when i put in the new motor and it has about 11,000 miles on it now and the mounts are starting to split in the middle why are they doing this? should i be using polyurethane mounts instead of rubber mounts?

68C15 · 07-14-2004, 07:31 AM

any pics of mounts where they are cracking? sounds like a loose nut behind wheel. JK I used to have the same problem with a '80 K20 with Moroso solid mounts & over 500 # torque. I eased off the hot-rodding. what actually was happening is the frame was flexing too much under acceleration & the block wouldnt. something had to give. if that is your situation you migh try some poly mounts.

71chevylongbed · 07-14-2004, 04:48 PM

they are cracking in the middle where they bolt to the stands. i'm going to replace them with poly mounts when i pull the motor to paint and maybe i'll try to keep my right foot off the floor

07-14-2004, 01:47 AM	#1
71chevylongbed Got Horsepower? Join Date: Sep 2003 Location: IDAHO Posts: 406	motor mounts cracking the motor mounts were replaces last august when i put in the new motor and it has about 11,000 miles on it now and the mounts are starting to split in the middle why are they doing this? should i be using polyurethane mounts instead of rubber mounts? __________________ 2001 Dodge 2500 Cummins, 4 inch lift, 35" Toyo MT's on Ultra wheels, P-Pump Conversion, AFE intake, Fass, 5 inch exhaust, Pyro,Boost,and Fuel pressure guages, and a whole bunch of other stuff "The Money Pit" SOLD-71 Chevy C10 long bed- 2/4 drop-- 350,th400, Edelbrock performer RPM intake,Edelbrock 600 CFM carb,Crower 240 cam,port and polish,Dynomax headers,HEI ignition,dual 2.5 inch exhaust with Flowmaster 50 series mufflers

07-14-2004, 07:31 AM	#2
68C15 blood type; Retumbo Join Date: Jan 2004 Location: next to my reloading bench Posts: 10,269	any pics of mounts where they are cracking? sounds like a loose nut behind wheel. JK I used to have the same problem with a '80 K20 with Moroso solid mounts & over 500 # torque. I eased off the hot-rodding. what actually was happening is the frame was flexing too much under acceleration & the block wouldnt. something had to give. if that is your situation you migh try some poly mounts. __________________ Man rule #77...if you own a 67 stepside with a caddy 472 you will never be in danger of loosing you man card

07-14-2004, 04:48 PM	#3
71chevylongbed Got Horsepower? Join Date: Sep 2003 Location: IDAHO Posts: 406	they are cracking in the middle where they bolt to the stands. i'm going to replace them with poly mounts when i pull the motor to paint and maybe i'll try to keep my right foot off the floor __________________ 2001 Dodge 2500 Cummins, 4 inch lift, 35" Toyo MT's on Ultra wheels, P-Pump Conversion, AFE intake, Fass, 5 inch exhaust, Pyro,Boost,and Fuel pressure guages, and a whole bunch of other stuff "The Money Pit" SOLD-71 Chevy C10 long bed- 2/4 drop-- 350,th400, Edelbrock performer RPM intake,Edelbrock 600 CFM carb,Crower 240 cam,port and polish,Dynomax headers,HEI ignition,dual 2.5 inch exhaust with Flowmaster 50 series mufflers



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