D-282 Engine Question

labman98 · Sep 7, 2013

I posted this question in the wrong forum somehow. But could someone tell me what the clearance specs are for the rods and mains on a D-282? I'm going to check mine today and don't have my new manual yet.

Thanks!

rustred · Sep 7, 2013

a thou. and a half is a good #.

rustred · Sep 7, 2013

checked manual and it says, .9-3.4
so yes .0015 is ideal as in new.
for used even .0025 i would replace before getting to 3 thou.
you doing the plasiguage thing on them with engine in tractor?

labman98 · Sep 7, 2013

Yep I used plastic-gage. My rods are.0015 with standard bearings and mains are .002 with standard. Think I will go back with new standard rods and .001 over mains. That sound good?

rustred · Sep 7, 2013

better just stay with the standard new main brgs. .001 will be too tight if you can even get brgs. that are .001 over.
those 2 measure ments u posted are good unless you are actualling overhauling the engine.but for the sake of just replaceing brgs. i say they are good. the mains are good for up to .004. post a pick of the rod and mains if you take them out.

IH fan · Sep 7, 2013

(quoted from post at 13:07:10 09/07/13) Yep I used plastic-gage. My rods are.0015 with standard bearings and mains are .002 with standard. Think I will go back with new standard rods and .001 over mains. That sound good?

Don't know anything about diesels, but for a gas, too tight and you won't get enough oil to lubricate.... I'd think the same for diesels. I'm with rusrtred.

pete 23 · Sep 7, 2013

Over the years I have had many of those birds apart and the bearing clearance is always on the higher side of the book specs. Plastigage will give you some bad reading just by the temperature of the plastic and remember , different platigauge for different range of clearance. If checking mains from underneath, crankshaft has to be supported (pushed up) to get accurate readings. I prefer shim stock for accurate readings.

rustred · Sep 7, 2013

and that will make the brg. run hot and just keep getting hotter and hotter till the brg gives out then its knock knock knock and smoke out the breather! and then BANG!

Janicholson · Sep 7, 2013

Not a flame, just reality, Insert bearings are standard, or undersize, as the journal wears it gets smaller. Jim

rustred · Sep 7, 2013

yes , for sure , we got corrected by the teacher. honest mistake jim.lol. "i knew that" ... wasnt that a maxwell smart saying?

charlieu · Sep 7, 2013

That's correct, you need to support the weight of the crankshaft (push it up to the top of the main bearings) to accurately measure the clearance on the bottom. What I taught my students to do was take and cut a strip off of the time cards that we had in school, and lay it on a couple of the lower main bearing inserts and then measure the other bearings. The time cards were the thickness of the old post cards. It worked good and it also prevented the crank from turning and messing up the plastic gauge.

JLE · Sep 7, 2013

An old rule of thumb, was .001 per 1" dia of shaft. 2.5 main .0025 running clearance.
Had a W-9 in frame overhaul, had about 4.5 clearance, slipped .002 under size in got the old girl warmed up good running on dnyno, come to sudden stop, ended up putting standard brs in. One of those lessons you learn over the years.

Janicholson · Sep 7, 2013

Harmony, peace and harmony. Jim

labman98 · Sep 7, 2013

Ok I will go with standard on both. Thanks all for the info!

D-282 Engine Question

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