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Discussion Starter #1 (Edited)
Has anyone here personally replaced a 451 water pump? My grandaughters 09 has developed a leak in the water pump seal and I'm looking to replace the pump before long. I do all my own mechanic work and have changed out several smart engines, but would rather not have to completely remove the engine if possible. Would the "lowering rods" drop the engine far enough to change out the pump? If so, does anyone have the measurements and thread sizes. (would like to make a set for myself) Also, If I remember correctly, there is no gasket used on the pump....Just a sealant bead as on most smart engine parts. Any recommendations as to brand and type sealant. I haven't had really good results with the blue stuff and this is not a place you can tolerate a leak.
 

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Discussion Starter #2
more on water pump post

After I posted about the water pump, It ocurred to me that I should have perhaps went to evilution first. I just did so, and they have the information I needed about the lowering rods and an excellent pictoral on both tipping and lowering the engine, but no mention as to this actually provides enough clearance to replace the pump. From the pictures, it would appear that it probably does. As before....any first hand information welcomed.
 

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Discussion Starter #5
Thanks to jetfuel and jwight for digging up what information that was available. Still not a real definative answer, but very helpful. I think I'll go ahead and make a set of lowering rods...I've been wanting a set anyway, and we will see how the job goes with them.
Will let you know the outcome.
 

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Looks like Evilution has a tutorial, however it is pay-per-view.

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In his first post the OP states
After I posted about the water pump, It occurred to me that I should have perhaps went to evilution first. I just did so, and they have the information I needed about the lowering rods and an excellent pictorial on both tipping and lowering the engine, but no mention as to this actually provides enough clearance to replace the pump. From the pictures, it would appear that it probably does. As before....any first hand information welcomed.
I think he is looking for someone currently on the forum who has replaced a water pump, that can give him some practical insight.
 

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I lowered the motor to gain access to the alternator, which is above the water pump, I used a floor jack and a block of wood with no problems. Since I had to remove the motor mount on the pass side (of the car) I didn't see where a lowering rod would help. Plus that mount is on the top side of the frame so it would have to be removed for the motor to drop down.. (working from memory here)
 

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Discussion Starter #9
The preceeding from jwight57 made good sense, so I tried it. I removed the bolts from all the motor mounts...upper and lower both, but I'm not sure all of them would have been necessary. I did have to remove the Xframe and pry the rubber muffler hangers off before lowering. Getting the motor to arrive in the same position upon raising, relative to the motor mounts, was a problem,using just the jack and a block of wood . Previously when I had removed motors, I had fabricated a fixture to bolt the motor to my trolley jack at it's center of gravity for lowering and raising it.After blocking the motor up and bolting that on, everything fell into place. After completing the job and looking things over before putting the shields and wheel back on, I'm not to sure but what the job could be done without lowering the motor at all if the crankshaft pulley was removed for access to several of the pump bolts. By the way, the pump housing does have a molded, reusable, neoprene gasket. (sort of O-ring type) It had been installed originally with silicone grease, so I cleaned it, re-greased it and used it again. Maybe not the best practice, but it didn't leak. A new pump pobably comes with a new gasket, but I was replacing with a good used pump from my spare stash. (Some guy on ebay wants $28 for that little gasket)
A related note....When I removed the spring-loaded Idler pulley, there was only a tiny bit of spring movement. I clamped it in a vise and excersized it a little and found that it had apparently set in one spot for so long that rust or crud had pretty well locked it in place. After I broke it loose, it worked like it should have. Could be a cause for a low functioning pump or alternator, especially on some of our older smarts!
































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