Six Cylinder Water Pump
Page created by T Nov 24th 2007:
Six Cylinder Water Pump:
The Water Pump on red, blue and black 6 cylinder Holden Engines is relatively easy to replace. Three bolts hold it to the block. A 1/2" AF spanner is used on them.
Water Pump Pulley and Fan Belt Length:
Red/Blue/Black 6 Cylinder Pump Types:
3 pumps will bolt to all red, blue and black blocks. The early reds
used a pump with a smaller hub (587), Mid HK they went to a bigger hub
same length pump (726 or 814). This ran through to May 1981 VC
Commodore. VH-VK use a pump with a bigger bearing and longer shaft
(815). All these pump use the same gasket onto the block. End of submission my MyEHHolden.
Water Pump Mounting Holes:
Submitted by ben simpson on Mon, 09/01/2017 - 12:21.
yes all of these bolt holes are blind and do not enter the water jacket.
End of submission by Ben Simpson.
Check for failed bearings by wobbling the pulley. There should be little or no movement. Failed bearings make a groaning noise which is most noticable at idle.
Water Pump Seal:
When the Water Pump Seal fails there can be coolant loss associated with it. The leak can be hard to find because the Seal exit point is buried behind the Pulley and it mostly leaks after the Engine has been shut down. This is because the Engine temperature reaches a peak after the Water Pump stops turning since there is no Coolant flow through the Engine.
A dentist's mirror can be used to view the escape hole and check for Coolant leaking from the hole. Watch for tell tale signs of coolant leak around the pulley. Coolant usually changes to a different colour once it dries out. Green coolant can turn to a reddish/white colour.
If the Engine has a Bypass Hose the new Water Pump will need to have a hole drilled. When you look down the small connection of a new Pump you'll see it's blanked off. If your Engine uses a Bypass Hose you will need to drill through to allow Coolant to flow through.
Loosen the Pulley Bolts while the Fanbelt is still connected and under tension. Press down on the belt to make it grip the Pulley and prevent it from rotating. Don't remove the Bolts until after the Fan Belt has been removed. Once the Bolts are removed sometimes the Pulley can be hard to remove because the Shaft it is mounted on rusts. It pays to rub the rust off the shaft with Emery Paper then spray some WD40 or put some oil there before trying to remove the Pulley. The Pulley tends to bind onto the Shaft so working from side to side is better than a single force because it prevents the Pulley binding in place.
most of these water pumps are made by GMB of Japan and just re packaged into other company boxes .HOLDEN ALSO USED gmb WATER PUMPS JUST PUT INTO THERE BOXES DURING THE 80'S & 90'S.. All now days use the pressed steel impeller , there are places that sell these water pumps and can fit a cast iron impeller for you , such as Auto surplus check out there Ebay store and ring them for a price to have a cast iron impeller fitted one of there NEW pumps ..
Cast Iron impellers are hard to find now days but they have plenty of NOS ones.. wombat.