DixieDeere Posted September 3, 2014 Share Posted September 3, 2014 Came home with a '89 R Model Today. Looks to have the 300 or 350 but would like to know which. I believe the previous owner said it started as a single axle tractor and an area shop put tandem camelback rears under it and replaced the factory 5 speed with a 10 speed. I assume there are codes stamped on the engine to determine the engine HP or even a plate but didn't see them. Thanks for the help. Quote Link to comment https://www.bigmacktrucks.com/topic/36936-1989-r-model-engine-id/ Share on other sites More sharing options...
bts-4120 Posted September 3, 2014 Share Posted September 3, 2014 bet it left the factory as a maxidinye but as old as it is who knows if the motor's been swapped should be a tag either on the valve cover or behind the fuel pump Quote Link to comment https://www.bigmacktrucks.com/topic/36936-1989-r-model-engine-id/#findComment-258406 Share on other sites More sharing options...
2stacksuperdog Posted September 3, 2014 Share Posted September 3, 2014 With a 5 spedd it would most likely be a 300. Being a 89 it should be a Econodyne. there also should be a plate behind the injection pump with the engine info. Quote Matt Link to comment https://www.bigmacktrucks.com/topic/36936-1989-r-model-engine-id/#findComment-258409 Share on other sites More sharing options...
j hancock Posted September 3, 2014 Share Posted September 3, 2014 There is a stamped number in the cast portion of the timing chain cover in front of the injection pump.Examples, ENDT676 or ETAZ673A or ENDT673. Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/36936-1989-r-model-engine-id/#findComment-258412 Share on other sites More sharing options...
DixieDeere Posted September 3, 2014 Author Share Posted September 3, 2014 Thanks, I'll look tomorrow. Our old '78 has the 300 in it. It's amazing how they sound and pull alike. The newer one has power steering, power steering, and power steering, which makes it a little nicer. Not even that excited about the A/C but really fired up about the power steering. It'll just be hauling grain out of the field and Macks are set up perfect for that. Our old '78 just plain has the torque, so much that even if you should have downshifted 3 or 4 gears, it'll usually pull out of it. Spent less on that Mack than several pickups. Amazing trucks. Quote Link to comment https://www.bigmacktrucks.com/topic/36936-1989-r-model-engine-id/#findComment-258414 Share on other sites More sharing options...
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