Ford 445A CAV injector pump leak

jigggawatt · Oct 9, 2017

I just cleaned and resealed my Lucas CAV pump on my ford 445A tractor. It runs good but has a leak around the bottom large advance bolt. I think I知 missing something. I looked for a cracked housing but it looks good. I installed new orings and it still leaks. I see in some diagrams it shows a Dowty washer. I don稚 know what I知 missing. I have a new gasket and two new orings on the large bolt and a new sealing washer on the stud side, Thanks for the help.

thepumpguysc · Oct 11, 2017

Some/a lot of the older head locating screws have a steel washer also to collapse the oring.. it gets stuck up in the adv. housing on disassembly & lost during clean up..
it looks just like the steel line washer only larger..
IF your h. loc screw has 2 defined oring grooves, then you don't have the washer.. BUT if it has 1 oring groove by the top & no groove at the threads.. you need the washer.

jigggawatt · Oct 11, 2017

thepumpguysc said:
Some/a lot of the older head locating screws have a steel washer also to collapse the oring.. it gets stuck up in the adv. housing on disassembly & lost during clean up..
it looks just like the steel line washer only larger..
IF your h. loc screw has 2 defined oring grooves, then you don't have the washer.. BUT if it has 1 oring groove by the top & no groove at the threads.. you need the washer.

Thanks for the reply. I have two orings. It sure looks like it痴 cut for a sealing washer where the bolt hits the housing. I don稚 have that size in the kit. I知 going to try to find one today. The housing looks good . I can take a mirror and watch it drip out ouf the side of the bolt. I致e even tried the square shaped orings .