Cobalt Boats Forum
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I ended up prying it out with a screwdriver.Good report. Hope all is well. Thanks to information here, I now carry an 8mm socket for this part. The tool kit I had previously didn't go that small.mdadgar wrote: Mon Sep 06, 2021 1:24 am So I finally got to use my Volvo "special tool". Boat was overheating in the no-wake zone so I went to replace the impeller with the spare while tied up to the launch ramp dock. Thank dog for Volvo putting the raw water pump on the front of the engine where it belongs.
The POS aftermarket impeller that my mechanic installed at the beginning of the season wasn't threaded, so the tool didn't work.I ended up prying it out with a screwdriver.
Said aftermarket impeller only lasted about 15 boat days this season. It was missing a couple of blades already.
Only Volvo OEM for me from now on. Two more on order arriving in a week or two, one to replace my on-board spare and one for next season's replacement.
- Mark
Over how many years? You want to do this every two years and if you put that many hours, more often than that.2023BlackR8SURF wrote: Sat May 20, 2023 6:35 pm He guys, changed mine today. This one has 117 hrs on it. Anyway. The Sherwood puller worked but had to modify a larger screw head going into the bottom of it and then used very small, but thick enough piece of cardboard to shim it even more. Got it out. Used the Glycerin to lube it up. Put the Sherwood tool on it to get it started and tapped it in very easily with a dead blow. Went in very nicely. Will run it out to the lake for a test run, but this document and pictures worked very well. Simple task. Thanks everyone!
Don't really know on the dry run. I just bought the boat from an individual. He said they did 50 hrs service on it which i see they changed oil only. I have the receipt. The boat is a 2021 model so not too old.bruceb58 wrote: Sat May 20, 2023 6:52 pmOver how many years? You want to do this every two years and if you put that many hours, more often than that.2023BlackR8SURF wrote: Sat May 20, 2023 6:35 pm He guys, changed mine today. This one has 117 hrs on it. Anyway. The Sherwood puller worked but had to modify a larger screw head going into the bottom of it and then used very small, but thick enough piece of cardboard to shim it even more. Got it out. Used the Glycerin to lube it up. Put the Sherwood tool on it to get it started and tapped it in very easily with a dead blow. Went in very nicely. Will run it out to the lake for a test run, but this document and pictures worked very well. Simple task. Thanks everyone!
Was that impeller ever run dry...even for a few seconds?
With all my injuries last season, I didn't replace my impeller myself. At the end of the season, I had a mechanic tow our boat to his shop as we have no trailer. I had him change the impeller, change the oil and filter, change gas filter, and change the gear lubrication. I had all the parts, or so I thought. I couldn't find the Volvo impeller. Don't know where I put it. He put a Sierra impeller on it. Hope we don't have problems. This weekend was first time out and running temperature was right on.Big Block Power wrote: Mon Sep 06, 2021 1:28 pm Yep never ever use aftermarket impeller for obvious reasons. I've been a OEM guy for everything. They spend millions of dollars doing R&D for a reason. The others not so much.
That impeller is in horrible condition...were there any pieces missing? If so, hopefully they didn't end up in the heat exchanger.2023BlackR8SURF wrote: Sun May 21, 2023 7:48 amDon't really know on the dry run. I just bought the boat from an individual. He said they did 50 hrs service on it which i see they changed oil only. I have the receipt. The boat is a 2021 model so not too old.bruceb58 wrote: Sat May 20, 2023 6:52 pmOver how many years? You want to do this every two years and if you put that many hours, more often than that.2023BlackR8SURF wrote: Sat May 20, 2023 6:35 pm He guys, changed mine today. This one has 117 hrs on it. Anyway. The Sherwood puller worked but had to modify a larger screw head going into the bottom of it and then used very small, but thick enough piece of cardboard to shim it even more. Got it out. Used the Glycerin to lube it up. Put the Sherwood tool on it to get it started and tapped it in very easily with a dead blow. Went in very nicely. Will run it out to the lake for a test run, but this document and pictures worked very well. Simple task. Thanks everyone!
Was that impeller ever run dry...even for a few seconds?
Sierra is perhaps the one aftermarket brand that comes to mind that I would trust. They're sold everywhere, from West Marine to high end dealerships. I've heard they use different manufacturers or sources for their impellers, including Johnson and Mercury, and didn't see much difference between my boat's Volvo and Sierra equivalent. I've ordered the Johnson 09-812B-1 as a replacement for my Volvo kit 21213664 at half the price, as it appears Johnson is likely the manufacturer of both the Volvo water pump and impeller.Krob1114 wrote: Mon May 22, 2023 8:11 am He put a Sierra impeller on it. Hope we don't have problems.