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Can you pull off the lower unit after you drain the oil and coolant without having to remove the radiator as an assembly to install the water pump? How do you get the lower unit off? ? Is there any other bolts other than the ones on the outside that I have to take out? This is my first replacement. After you get the lower unit off, does the Water pump come out from the rear?
Thanks,
Nightrider1
 

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There are bolts all the way around the lower cover and access to at least the top four is blocked by the radiator. There are thirteen bolts holding the lower cover in place and most of them are different lengths. I made a cardboard plate to lay out the bolts as I removed them to ensure I could put them all back in the correct location. There is a kit of the o-rings and the cover gasket available from several vendors, be sure you get one that includes the oil seal. The water pump comes out from the front of the lower cover but it is held in place by three small bolts on the inside of the cover. When you are ready to reassemble, you may want to use some vasaline to hold the o-rings in place (they pinch easily) and ensure the neutral switch is properly aligned before locking all the bolts down. I recommed putting in a couple of bolts to hold it in place then turn on the ignition and test before completing the job.
 

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One more question. Does the water pump contuninually spin the impeller, or does it come on when The thermostat opens? My thermostat is good, and I was about to double check my water pump. Is the impeller interchangable? If I find any left,right. up, or down play on the impeller, I am gonna change it out anyway. Since I already have it.
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David
 

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The water pump is shaft driven off of the oil pump. It turns all the time(hopefully:dude:). Make sure that you put a little rubber safe lube on the o-rings when you go to put the assembly back together or you might more experience with R&R than you wanted.;)

Hobie
 

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I wish the water pump did not have the oil orifice running into it. If it was not, I would just put a amall electroic water pump on it. I flushed my radiator 2 times, and added the flush, drove it 60 miles, and I found a leak on my Raditor Cap. Also, I pulled the 2 water pump screws and I could wiggle the water pump 1/4 inch in either direction, excepy up or down. There I could only move it 1/8 of an inch. Bad water pump! I took the water pump off of my parts bike. Gonna get it put on next week. I did mamage to pull my heat bars down to under the big wite bar, so the flush is helping. I'm gfad it did not run hot. I just lost 50% of my cooling volume through my radiator.
 

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I had really no problem changing the pump without removing the rad...(of course, laying on the ground in the gravel driveway kinda bit the big one)

No doubt there's more room with the rad off, but unless you're a 1000 owner (which I believe had philips head screws behind the rad...ugh!!), a 1/4 " ratchet gets the cover off....
 

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I changed the water pump on my GL 1100 without pulling the radiator. I had trouble with one of the bolts: Highlighted in the attached. The bugger sheared off on me. I am currently replacing the water pump on my project bike. Before I attempted to remove this particular bolt, I soaked it from behind with PB Blaster. I don't know if this helped, but I had no problems with it.
 

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