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| | | | Joined: Oct 2000 Posts: 244 'Bolter | | 'Bolter Joined: Oct 2000 Posts: 244 | I have a 1953 GMC with a 235 ci engine. Any idea of what type of rear main seal it has? It was rebuilt about 10-12 years ago. | | | | | Joined: Dec 2008 Posts: 901 'Bolter | | 'Bolter Joined: Dec 2008 Posts: 901 | What year is your 235 engine?
Brian
1955.2 3100 Truck
The older I get the more dangerous I am!!!!! | | | | | Joined: Oct 2000 Posts: 244 'Bolter | | 'Bolter Joined: Oct 2000 Posts: 244 | It’s a 1955 235 ci engine | | | | | Joined: Mar 2014 Posts: 4,509 Moderator, Electrical Bay | | Moderator, Electrical Bay Joined: Mar 2014 Posts: 4,509 | Then it most probably will have the rope type seal. The neoprene seal was developed in 55 but as I recall 1956 was the first year where the slot was machined to the right dimensions for it.
~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end
| | | | | Joined: Dec 2017 Posts: 1,652 'Bolter | | 'Bolter Joined: Dec 2017 Posts: 1,652 | Correct. 56 pass car was first year for neoprene and the rear main cap was machined specifically for that seal, whereas the earlier motors had less precise, deeper, cavities for the rope seal.
Mike
| | | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | 1955 was a change over year.
Early engines used shims on the mains and the deeper seal groove, and later in the year engines did not use shims and had the shallower seal groove as mentioned.
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