[Slim542]

Hey, Everyone; I am leaking coolant from the weephole on the bottom of the water pump. This all started after I took the engine apart, rebuilt the top end, and replaced the crankshaft. Anyway, I thought I got the water pump seal back in correctly, but obviously, I must not have, as I have a leak. I also noticed that when I took the water pump cover off, it appeared the impeller was rubbing against the cover.   

Looking for some advice on what to check. 

How do I know if the water pump seal is fully seated? 

[NMKawierider]

Hey, Everyone; I am leaking coolant from the weephole on the bottom of the water pump. This all started after I took the engine apart, rebuilt the top end, and replaced the crankshaft. Anyway, I thought I got the water pump seal back in correctly, but obviously, I must not have, as I have a leak. I also noticed that when I took the water pump cover off, it appeared the impeller was rubbing against the cover.   

Looking for some advice on what to check. 

How do I know if the water pump seal is fully seated? 

Can't view the .HEIC files but go by the service manual. Make sure the drive is seated correctly as well...and get a new seal-set.

[Slim542]

Updated the pictures.   

[NMKawierider]

Oh no....bad barries.

[Slim542]

Hey everyone,  Thanks for your help.   

So, I removed the left cover and replaced the seals with new ones.

I've replaced the water seal assembly, Oil seal, bearing, and impeller seal.
I'm still getting a steady leak of coolant from the weephole.   

Any Ideas?   

[NMKawierider]

Something is cracked or was assembled incorrectly.

[Slim542]

I did not see any cracks when I disassembled the pump.   

How far should the water seal assembly sit into the case? Is it possible that it is not fully seated?    I used a 1-inch socket to hammer it into place. Paying attention to not damage the seal.

The impeller has a seal. Does the white ceramic ring face the inside of the impeller, or does the rubber side face the inside?   

[NMKawierider]

Not seen the CFM seal personally but all mechanical seals are two-part-one sets in the case with a rubber outer seal and usually the hard ceramic inner surface..which could be one of the two materials used together..most being carbon and ceramic for the rotating face. The part the moves is spring loaded to bare the correct pressure on the two surfaces and it will be against the impeller. ANYTHING other then water or coolant between those surfaces will cause it to not seal...even a finger print sometimes is enough let alone motor oil. It must be assembled with water or coolant between the two before operating to avoid scaring. Otherwise the seal is ruined. I see a full stream coming out of the tube which means little or no sealing at all. It will need to come back apart to see what's wrong.   

[Slim542]

Just removed the water pump cover.  Everything looks in place, and I don't see any cracks.   

I currently have the white side of the washer facing out with the rubber on the inside.   Is this correct?   

I also wonder if the water seal assembly is seated far enough in the case. I used a 1-inch socket to press the seal in, but I can't find any info on how far it needs to be seated. Do you have any ideas? 

[NMKawierider]

Never saw the ceramic side being the rotating part and where is the rest of it like the spring? And are those chips or dents I see in the surface of the case part?

[Slim542]

The seal with the spring is still in the case, and I have not removed it yet. The small blemishes in the case might be grease. The service manual advises using a small amount of sealant when setting the seal in the case.   I'm wondering about applying air pressure to the weephole to see if I can tell where its leaking from.   

I did have a small amount of grease on the white impeller seal.  But that was a lot of water running out of the machine and I never started it.     

[NMKawierider]

Had to look. So it is backwards from most others...leave it to the Chinese....lol. The lip has to go all the way flush and the spring holds the carbon part out to make contact with the ceramic part. How it seals to the impeller is a mystery.

   

[Slim542]

Their service manual leaves a lot to be desired.   

Going to clean the rubber seal attached to the spring and the ceramic washer. 

Going to make sure the water seal is completely seated. 

Wish me luck.  I hope I don't have to take the case off again.   Oil is getting expensive. 

[NMKawierider]

Good luck...lol