Persistent shower leak after Sayco compression valve rebuild

Users who are viewing this thread

srdstm

New Member
Messages
2
Reaction score
0
Points
1
Location
Alpharetta, Georgia
I've had an extremely frustrating shower valve leak that I have not been able to repair. The house is a 1969 house with no access to pipes behind the tile; I installed cutoffs on the hot/cold water lines in the basement just to be able to work on this shower. The compression valves are sayco, and I've repaired and/or replaced valves and valve seats for the main tub - hot, cold, and diverter, as well as the hot valve for the shower with no problems. However the Cold faucet for the shower continues to leak persistently, even after multiple new valve seats, multiple new valve assemblies, and multiple re-checks of my work.

This particular stem was extremely difficult to get out originally, and the old valve seat was almost entirely encrusted with green mineral buildup. I used white vinegar to try to clear the additional mineral buildup out of the threads. When I look in there, I cannot see any visible damage to the seat threads or any buildup. I've even attempted using teflon tape or pipe dope to see if I could get a better seal on the valve seat. I've been very careful to not cause cross-threading when installing valve seats.

In every single case - whether I rebuild the old valve assembly or install a new one (as I've done in the other three installs) the leak is an almost unbroken stream of drips from the shower head that actually seems to get slightly worse if I try to tighten the valve too far. I've tried multiple new washers, and thicker washers. It looks like the new washers I put on are meeting the valve seat correctly, because I can see the impression and it looks good when I take it all apart again. There has never been any change in the end result so I have reached the conclusion that there is something else going on that I cannot fix by replacing the valve stem and the valve seat.

What could be causing this? I had assumed that some sort of crack in the pipe itself would cause a leak behind the wall that would be detectable in the basement. Reaching my wits end and would really like my shower back.
 

Terry

The Plumbing Wizard
Staff member
Messages
28,686
Reaction score
2,808
Points
113
Location
Bothell, Washington
Website
terrylove.com
You have more patience than me. Often we just replace the entire valve in a case like yours. Moen and Delta can be had with large plates that cover the hole. Here is a Moen TL2368EP trim for their Posi-Temp valve. It also works for three handel replacements.

tl2368ep_repair_4.jpg


A new Moen Posi-Temp with their wider than normal plate to allow access for replacement.

pp-faucet-seat.jpg


Pfister replacement seat on the right from a different job.

https://terrylove.com/forums/index.php?threads/moen-tl2368ep-shower-remodel-trim.61164/
 
Last edited:

Smooky

In the Trades
Messages
2,298
Reaction score
149
Points
63
Location
North Carolina
It is possible to damage the valve body if the stem is closed when you screw it in. If that has happened the valve will need to be replaced. Anytime you are screwing in a stem it should be turned in the open position. If it is installed in the closed position it may leak because it will not fully shut after being installed.
 

srdstm

New Member
Messages
2
Reaction score
0
Points
1
Location
Alpharetta, Georgia
I did not have any of the valves in the closed position when screwing it in. Also, I replaced this ONE valve five times with either a brand new one or a rebuilt one. I've installed five others previously with no issues at all.
I'm back to asking very specifically - what could cause this when the valve installation is fine, and the valve itself is fine? Is it the pipe behind the valve?
Cutting holes in tile is not an option for me.
 
Top
Hey, wait a minute.

This is awkward, but...

It looks like you're using an ad blocker. We get it, but (1) terrylove.com can't live without ads, and (2) ad blockers can cause issues with videos and comments. If you'd like to support the site, please allow ads.

If any particular ad is your REASON for blocking ads, please let us know. We might be able to do something about it. Thanks.
I've Disabled AdBlock    No Thanks