The Ford Barn

KMBeers · 01-18-2026, 04:09 PM

I am just finishing my 7 tooth steering box rebuild. I am using the oil seal retainer, A-3527-T with the tube and I am going to install the A-3574-X sector seal kit. The o-ring supplied with the seal kit is a 0.139 x-section. The sector bushing was installed 0.09 deep from the mounting flange. The resulting pocket that the o-ring fits in seems too small for a 0.139 o-ring, and it should be a 0.103 size. Anybody else here seen the same thing or am I just overthinking this? With the bore the bushings fit in at 1.250 and the shaft size at 1.125, I think the 0.103 is a better option, especially with there effectively being no pressure on the seal.

01-18-2026, 04:09 PM	#1
KMBeers Senior Member Join Date: Dec 2021 Location: Havertown, PA Posts: 153	Sealing the 7 Tooth steering box I am just finishing my 7 tooth steering box rebuild. I am using the oil seal retainer, A-3527-T with the tube and I am going to install the A-3574-X sector seal kit. The o-ring supplied with the seal kit is a 0.139 x-section. The sector bushing was installed 0.09 deep from the mounting flange. The resulting pocket that the o-ring fits in seems too small for a 0.139 o-ring, and it should be a 0.103 size. Anybody else here seen the same thing or am I just overthinking this? With the bore the bushings fit in at 1.250 and the shaft size at 1.125, I think the 0.103 is a better option, especially with there effectively being no pressure on the seal.