CAT 1693 - Specs and the story on them? - Page 4 - TheDieselGarage.com
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Thread Details Posted by kblackav8or, this thread has received 48 replies and been viewed 33720 times.

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Old 01-16-2008, 01:14 AM   #31
fred43
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i had a 74 freightliner with the 425 in it.nuthing ever went wrong with it in 700,000 miles except the little check valves in each end of the injecter lines. they went bad and the power went south. a mech at miami cat was listening to it and said" i know whats wrong" he grabbed each injector line and said they were pulsating. sure enough, they were . a new set of check valves and all was ok. it ratted like hell at about 900 rpm with no load on it. sounded like it would blow up. 335 cummins did that too.,,sounded cool. it was the injection,,,no leaks either. that engine was bone dry. i sold it to a guy in bud lake nj who rans scrap paper to ohio and bricks back, he ran it for 1,300,000 miles before a tear down. the rings were perfect,,they did a recon head and turbo kit and buttoned it up for another few 100,000 mies and he retired. a great engine,,,butt i had to have a 600 kta in 1980.
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Old 01-16-2008, 01:16 AM   #32
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i should say,,it was a runner,,,i would be cruisen and every one else up and down the east coast was pushing to run with me,,hehe,,,like i said,,a good powerful engine in its day. you could easily get the 550 hp, but better have your wallet ready sooner than later.
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Old 02-09-2009, 09:34 PM   #33
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Originally Posted by Meow CAT View Post
I would say that when most people are talking about 425 Cats they are refering to the 3406B air to air motor from the mid 80's and newer, and like you said information is hard to find on the 1693 mostly due to the fact that there arent many left running. Also the last production year that the motor was offered was 1976, again another reason it is hard to find info.
Idk about that Dwight Cheek out of Amarillo Texas got the last 1693TAs in 1982 thats when they stopped making them I thought.
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Old 02-09-2009, 09:53 PM   #34
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Idk about that Dwight Cheek out of Amarillo Texas got the last 1693TAs in 1982 thats when they stopped making them I thought.
Last truck build October 1980. After Feb. '80 you had a choice between 325hp 3406PC and a 425hp 1693. The first 06's blew up, so most waited for the bottom end fix, tho some opted for a 425 93. 1693's sat on shelves til way in to the upper 80's, tho you had to pull strings to get one in a truck (they're ag/ gen motors also)...T
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Old 02-10-2009, 10:26 PM   #35
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Ya 1980 sounds about right cause I knew it was the early 80s when Dwight Cheeck got that last ones in trucks. I know that the 1693s made Monfort famous thats what they ran there trucks and nothing could out pull them.
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Old 02-11-2009, 12:30 AM   #36
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im sorry for my ignorance. but i remember in the 90's i did a clutch job(it was an oil spill) but when i went to the dealer, and just said it was caterpillar and they gave me a seal of an model A cranshaft. but when i took off the clutch and the fly wheel and it was a gigantic seal. the truck stoped for three weeks becausew nobody had seal. but i do remeber is a cover band behind the block, and one of my friends said it looked as a marine motor. it was a freightliner cab over. did anyone ever seen something like this?
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Old 02-11-2009, 01:48 AM   #37
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im sorry for my ignorance. but i remember in the 90's i did a clutch job(it was an oil spill) but when i went to the dealer, and just said it was caterpillar and they gave me a seal of an model A cranshaft. but when i took off the clutch and the fly wheel and it was a gigantic seal. the truck stoped for three weeks becausew nobody had seal. but i do remeber is a cover band behind the block, and one of my friends said it looked as a marine motor. it was a freightliner cab over. did anyone ever seen something like this?
All 3400's have the same seal. A 3176 has a bigger seal held in with ten 6mm bolts. A brakesaver has gobs of seals, but still the same size and still hydro-dynamic... Welcome back bud...T
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Old 02-11-2009, 02:35 AM   #38
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... Welcome back bud...T
oh thanks , in that time i drove a 75 white road comander with a clack clack A model, with a transmition 12513. the other truck i had the motors didnt look the same. at the time i was broke, and it was easier for me to do the job. it wasnt the model 3406 . i have doubts if it was a 1673B,c,1674, 1693 or if it was a special production that was made1972 (1693) but i remember clearly is the big triangle shape cover behind the block, the flywheel on top of the shell. the seal was around the size of a dinner plate (10"-12"). do you remember seeing a seal like this?
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Old 02-11-2009, 02:58 AM   #39
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... Welcome back bud...T
oh thanks , in that time i drove a 75 white road comander with a clack clack A model, with a transmition 12513. the other truck i had the motors didnt look the same. at the time i was broke, and it was easier for me to do the job. it wasnt the model 3406 . i have doubts if it was a 1673B,c,1674, 1693 or if it was a special production that was made1972 (1693) but i remember clearly is the big triangle shape cover behind the block, the flywheel on top of the shell. the seal was around the size of a dinner plate (10"-12"). do you remember seeing a seal like this?
Honestly, sounds like a 343 or 344 dozer motor. I'd have to see it to know. That's a HUGE seal!!!!!!
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Old 02-11-2009, 03:12 AM   #40
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Honestly, sounds like a 343 or 344 dozer motor. I'd have to see it to know. That's a HUGE seal!!!!!!
its was something strange. I went to old truck show(athens) and I never seen amotor like this''( my friend from Chile he told hes seen a motor like this but in his country on a fisherboat). the other problem was that the cabover didnt lift the cabin but it was a 1970's.and someone bring from oregon state,I think that someone did a project to compete on strength vs kt's at that time

Last edited by pichu; 02-11-2009 at 04:21 AM.
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