12558968 - 8.1l Waterpump Bypass Hose

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Part# 12558968

Description:

Brand New Workhorse Waterpump (thermostat) Bypass Hose for 8.1L Engines in Workhorse Chassis.

Applications:

All Workhorse Chassis Equipt with an 8.1L Engine

What is the part number of the coolant crossover for the 8.1L 2004 p32 ( John, 02/15/2018 )

The part number for the crossover pipe was 12560724. Unfortunately that part is no longer available. ( Support )

Is the 8.1l water pump Bypass Hose used to bypass the heater? In other words does the hose eliminate the hose going to and coming from the heater core? Thanks for you help. Dave

( dave, 05/15/2015 )

Dave,

No, that is not what the waterpump bypass hose is for. Here is a description of it's purpose that I found on Hot Rod Magazines website:

All engines that run a thermostat need to have some type of bypass provision to avoid localized hot spots, minimize the chance of steam pockets developing, promote even and rapid warm-up, and prevent water-pump cavitation. On some engines, such as classic Chevy small-blocks, the bypass is internal; on others, such as your big-block Chevy, the bypass is external.

( Support )

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WARNING: Products may contain one or more chemicals known in the State of California to cause cancer and/or birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov

VIN Verification Service Item

This product allows for a VIN verification service.

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