844 ci engines ; BIG AL
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Category: Allis Chalmers
Forum Name: Construction and other equipment
Forum Description: everything else with orange (or yellow) paint
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=27930
Printed Date: 27 Jul 2025 at 5:18am
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Topic: 844 ci engines ; BIG AL
Posted By: DougG
Subject: 844 ci engines ; BIG AL
Date Posted: 25 Mar 2011 at 12:04pm
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Is there any difference in a BIG AL truck engine compared to an engine out of a crawler or scraper ?
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Replies:
Posted By: DonDittmar
Date Posted: 25 Mar 2011 at 12:05pm
i would think so as BIG AL was set for 450 flywheel HP, so I am sure the pistons/nozzles would be different
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Experience is a fancy name for past mistakes. "Great moments are born from great opportunity"
1968 D15D,1962 D19D
Also 1965 Cub Loboy and 1958 JD 720 Diesel Pony Start
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Posted By: DougG
Date Posted: 25 Mar 2011 at 12:20pm
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The info I have seen says it was avaliable at 350 to 450 hp ; but also 2 different styles 21000 and 25000 ; I guess turboed and intercooling did that ? Maybe ?
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Posted By: big al
Date Posted: 25 Mar 2011 at 11:37pm
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yes,depending on application,ther can be a number of differences-oil pan&pickup,accessory brackets & pulleys,exhaust manifolds,turbo pressure tube,oil manifolds,front engine bracket,flywhl housing,flywhl to accept truck clutch,inj pump&gov.settings.the basic engine and cam are the same.the best crank is from a 1974 or newer truck or scraper application.the best crank is a snub nose which would make you turn to a 6138.they did alot of updates between 69-74,so i would search for a engine 74 or newer.you might have to round up parts from several differant engine apps to complete a truck app.i even got parts off a 4w305 for my rebuild.the hardest part to find would be the flywheel to accept the 15.5" spicer clutch.if you need help give me a shout.219-405-3286 jack
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