'84 6.2 Burb + 91 6.2 motor = water pump issue! Help!?! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

3QTRTONS · 03-18-2012, 09:23 AM

Bought an '84 Burb that the PO had replaced the original 6.2 Diesel with one out of a '91 (or '92). The '91s serpentine system was gone so he set up a V-belt system on it. Ran it up and down the road; went fine. Long idle; fine.

Sold it to me. Driving it home, (12 miles) the temp pegs!

Am I right in figuring that the water pump is flowing in the wrong direction? I've googled this and it seems to show there may be a problem replacing the '91 water pump with an '84 because of the backing plate and/or timing cover may not be compatible between the two engines? If this is the case, is there such a thing as a reverse flow water pump for these?

OR,,,,,,, am I looking at this all wrong!?!?!?

**special-K** · 03-18-2012, 10:28 AM

The serpentine belt set-up uses a water pump with reverse rotation. If the P.O. didn't change the water pump to an earlier v-belt design you impellers are backwards and not giving adequate circulation.

03-18-2012, 09:23 AM	#1
3QTRTONS Registered User Join Date: Mar 2010 Location: Warren, ME. Posts: 235	'84 6.2 Burb + 91 6.2 motor = water pump issue! Help!?! Bought an '84 Burb that the PO had replaced the original 6.2 Diesel with one out of a '91 (or '92). The '91s serpentine system was gone so he set up a V-belt system on it. Ran it up and down the road; went fine. Long idle; fine. Sold it to me. Driving it home, (12 miles) the temp pegs! Am I right in figuring that the water pump is flowing in the wrong direction? I've googled this and it seems to show there may be a problem replacing the '91 water pump with an '84 because of the backing plate and/or timing cover may not be compatible between the two engines? If this is the case, is there such a thing as a reverse flow water pump for these? OR,,,,,,, am I looking at this all wrong!?!?!? __________________ 1969 ES5500 B E A S T 1976 K20 Suburban 1983 C10 'farm truck' 1984 K10 Suburban 1988 V30 Fire Truck 1941 Dodge WC18 Ambulance 2000 GMC Bus (parts warehouse)

03-18-2012, 10:28 AM	#2
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: '84 6.2 Burb + 91 6.2 motor = water pump issue! Help!?! The serpentine belt set-up uses a water pump with reverse rotation. If the P.O. didn't change the water pump to an earlier v-belt design you impellers are backwards and not giving adequate circulation. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~



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