670T vs 670HI
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=202629
Printed Date: 17 Sep 2024 at 2:01am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: 670T vs 670HI
Posted By: Smallfarm
Subject: 670T vs 670HI
Date Posted: 07 Aug 2024 at 7:44pm
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Need to put a new power plant in my L3, decided it wanted a view outside of the block. Mine was a 670T, I have found a 670HI in an L2. I'm sure it will be straight forward swapping but what's the difference between the two? I can't find much on the HI
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Replies:
Posted By: DrAllis
Date Posted: 07 Aug 2024 at 7:49pm
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No such thing. 670-T or 670-I or 670-HI. Never remember an I or HI ever in an L-2 or L-3.
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Posted By: Smallfarm
Date Posted: 07 Aug 2024 at 8:13pm
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I was just about to edit my post to HI as I was able to get a better look at it. It's definitely a 670HI owner said engine was replaced previously. They installed a new meter reading 900hrs and has about 3600 separator hours. So the I for intercooler is making sense now but they didn't actually intercool it. The replacement engine has the normal 670T intake.
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Posted By: Smallfarm
Date Posted: 07 Aug 2024 at 8:18pm
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The HI has a Roosa Master pump tagged 2400rpm. Our 7080 has the same pump with 2550 rpm stamped. Am I giving anything up without the full intercooler or is that impossible to know without knowing pump settings?
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Posted By: DrAllis
Date Posted: 07 Aug 2024 at 9:16pm
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No model L ever had an I or HI engine. So it was a used engine taken from an N-5 combine I think. Full numbers from the injection pump would help. If fuel wasn't turned down from 190 HP to 160 HP I might question how good the engine is ??
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Posted By: Lynn Marshall
Date Posted: 08 Aug 2024 at 7:32am
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The 670HI should have the counterbalanced crankshaft with the large viscous dampener. The original L2 injection pump might have been put on the 670HI to lower the horsepower and have the correct rpm range. The L2 front crankshaft pulley could then have been used. I think that the combine pulley has more grooves to run the hydraulic pump. Given the age of these engines, if it's ever been overhauled,it may have just an HI block and who knows what inside.
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Posted By: Unit3
Date Posted: 08 Aug 2024 at 10:42am
The HI should or would give you a larger turbo and the aspirated air cleaner. Back down the RPM's a few hundred and replace the harmonic balancer and I would think it would spin the belts just fine. You might even get a larger radiator with the HI. Check the water pump for side play and count the fan blades. One might give you more blades for more cooling. Long live the Gleaners.
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2-8070FWA PS/8050PS/7080/7045PS/200/D15-II/2-WD45/WD/3-WC/UC/C
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