How difficult is rebuilding a heater valve ( any secrets ) using the fillings rebuilding kit ? 51 3800 panel truck . Thanks.

The actual rebuild seal is only the size of a quarter.

Getting the valve apart & back together without destroying it is another thing.

Here is the best info. around on rebuilding them yourself..
http://www.pbase.com/dennygraham/ranco_hf_br

Or you could send it out & have it professionally rebuilt..
http://www.heatercontrolvalve.com/

Thanks for the great info. I have yet to see any place that has the info you can get here. Thats why I have 3 Chevys and one F--d. Thanks.

I sent mine in to a shop to have it rebuilt. I know if I would have tried myselfe it would have never gotten back togeather. Mine works great.