depends on the heater model [3 different possibilities], but you really need to remove the complete heater for a rebuild ... threaded rods sticking out the firewall hold the unit in, remove the hoses and the nuts off those studs and it'll come out

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature we find it attached to the rest of the world" John Muir
"When we tug a single thing on an old truck, we find it falls off" me
Some TF series details & TF heater pics & Rust-a-holics Unanimous parking lot