A huge thanks to the OP and for the great info posted in this thread. Swapped out the wp on my 07 GS450h. A heads up to those looking to do this on theirs, get the right belt as it's different(shorter) than the GS350 and you DO NOT need the idler pulley. The 450h doesn't have it as there is also no alternator. I also had issues with the o-ring on the water inlet housing. The one included with my waterpump was slightly missized and I ended up having to get a universal one to replace. Also for those thinking not to drain their coolant, it can be done but will be unnecessarily messy. If I were to do it again, I would just drain off a good portion of the coolant to simplify things. Hope this helps someone and thanks again guys!
-Steve
Can you list the parts you got and where you ordered from? i have an 07 GS350, I need replace my WP as soon as i order all the needed parts. thanks
Does anyone have the number of just the water inlet gasket that goes on the tube up top near the radiator cap? After two weeks I sprung a leak there and bought a box of random o-rings from the auto store. So far the one I found that fit is working, but for peace of mind I'd like to know the official number in case it leaks again.
finally did this on my 08 is250. I did the fill and drain method. I tired to do the fill and replace method but when I checked the level, no fluid came out so I had to add more fluid and then drain the excess. I used a scan gauge II tool and did the drain at 102 degrees until the flow was a thin stream and then I replaced the plug.
Currently have 124,900 miles (Purchased at 93k miles 5 years ago) on the car. Not sure if the waterpump had ever been replaced so I figure it'll be a great preventive maintenance.
Did a complete overhaul;
Aisin WPT-137 water pump (+2 gaskets) $97.21
Gates 36173 Idler Pulley $39.38
Thermostat (OEM 16031-31020) $48.20
Serpentine belt (OEM 99367-K1550) $60.29
Upper Inlet radiator hose (OEM 16571-31160) $25
Lower Outlet radiator hose (OEM 16572-31380) $37.14
Toyota super long life coolant (OEM 00272-SLLC2) $31.23/ 2gallons
Water wetter 12oz $10.94$
349.39 total waterpump haul.
Although I have a few questions regarding a slight difference between the water pumps.
In the old picture, the part that bolts onto the Pulley is circular. Whereas the new waterpump, it's somewhat of a flower shape. Should I be concerned? It's the exact part number ordered from amazon (sold by Aisin) WPT-137.
Also noticed some oil build up, however I never burn or lose oil in between oil changes. (Maybe the previous owner was bad at pouring oil into the engine and spilled everywhere??)
Discovered a ton of extra gasket maker inside the waterpump system which seems to somewhat disturb the water flow so I removed some (pictures below)
Oil residue? Waterpump - difference Waterpump difference Waterpump difference Old vs new thermostat Gasket Gasket Bolts had gasket on them, which was removed prior to using blue loctite New waterpump in place
Toyota owns a huge share of Aisan stocks, they make the parts for toyota/lexus. Notice how the toyota name is ground off that water pump, but the pump is brand new not reconditioned. The part you bought is oem but just through an "aftermarket" so I wouldnt be worried, if anything youre getting an improved superseded parts. I have 70k miles on my aisin pump and still going strong.
Toyota owns a huge share of Aisan stocks, they make the parts for toyota/lexus. Notice how the toyota name is ground off that water pump, but the pump is brand new not reconditioned. The part you bought is oem but just through an "aftermarket" so I wouldnt be worried, if anything youre getting an improved superseded parts. I have 70k miles on my aisin pump and still going strong.
Originally Posted by ibidu1
Also for belts you could have run a dayco (toyota also owns a share in) or even a gates serpentine belt.
Thank you for the quick response ibidu1. It's good to have a piece of mind that I didn't receive an old/inadequate part.
Something odd was that only one and 1/4 gallon was used to fill up the radiator and reservoir. I assumed it would hold much more granted I didn't remove/drain from the engine block itself and only drained from the radiator.
I also went with OEM/toyota serpentine belt because my buddy works at Longo and was able to give me his employee discount
Awesome pics. I'll need to do mine soon. I'm at 150k on the stock water pump.
Did you use the distilled water with the pre-mixed coolant? You shouldn't have to since the coolant was pre-mixed.
Wow, 150k on the stock pump is amazing.
I used the distilled water to flush the radiator/cooling system with the original water pump AND with the new water pump (probably not necessary but I figured why not).
Hi. I recently replaced my water pump on my 2009 GS350. I noticed however the new pump is leaking around the seal. I was told by the guy at the auto store to use the sealant so i applied it. However after i noticed the leak around the new pump i researched and saw a article saying that the newer gaskets dont require sealant and that it could cause a leak around the seal. Was wondering did you apply any to yours or you just installed the gasket alone?
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05-16-17, 04:18 PM
Hi. I recently replaced my water pump on my 2009 GS350. I noticed however the new pump is leaking around the seal. I was told by the guy at the auto store to use the sealant so i applied it. However after i noticed the leak around the new pump i researched and saw a article saying that the newer gaskets dont require sealant and that it could cause a leak around the seal. Was wondering did you apply any to yours or you just installed the gasket alone?
