How to remove the water pump impeller – Honda CX500, GL500, CX650, GL650 etc.

Here’s how to remove the water pump impeller on a Honda CX500, GL500, CX650, GL650, GL700, GL400 or CX400 motorcycle. This is the same process for the 400, 500 and 650/700 non-turbo variants.

Once you have removed your water pump impeller cover you can see the impeller itself:

Image of the water pump impeller in situ

The impeller is part number 19215-415-010 for the CX500 and 19215-ME2-000 for the CX/GL650. To see the differences see this page. The impeller is held on by an acorn nut. The acorn nut – 90201-415-000 – is still available new (eBay US and Amazon):

Here's how to remove the water pump impeller on a Honda CX500, GL500, CX650, GL650 etc.

A 10mm socket should get it off:

Here's how to remove the water pump impeller on a Honda CX500, GL500, CX650, GL650 etc.

Here's how to remove the water pump impeller on a Honda CX500, GL500, CX650, GL650 etc.

The threaded rod you see here is the rear end of your camshaft. The copper washer is stuck to the impeller here, too – make sure you locate it, as you don’t want to double up, or not have one at all. It’s part number 90441-706-000 (eBay US or Amazon). Not having one of these (or re-using a crushed one) can result in coolant getting past it, making it’s way down the threads and running out your weep hole.

Here's how to remove the water pump impeller on a Honda CX500, GL500, CX650, GL650 etc.

At this point you can hopefully pull the impeller forward – it slides onto splines on the camshaft so it shouldn’t have any rotational movement available. If you need to apply a prying force to the back of the impeller to help it off be very careful – you don’t want to snap the end of your camshaft. People have reported success using small two jawed pullers or even pressure with pry bars/screwdrivers on either side of the impeller, but again – be careful! Applying force to only one side of a stuck impeller could easily break the end off your camshaft, and that is going to be a headache you don’t want.

Here's how to remove the water pump impeller on a Honda CX500, GL500, CX650, GL650 etc.

Once removed you can see the rear part of the mechanical seal, and in this case the “polo mint” and the thrust washer/spacer still attached to the camshaft.

Here's how to remove the water pump impeller on a Honda CX500, GL500, CX650, GL650 etc.

If you came here from the triple bypass page, click here to go back.

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