Farm Equipment - 1957 Allis Chalmers WD45 Diesel knock solved

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1957 Allis Chalmers WD45 Diesel knock solved

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=26689
Printed Date: 27 Feb 2025 at 1:24am
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Topic: 1957 Allis Chalmers WD45 Diesel knock solved

Posted By: WD45Diesel57
Subject: 1957 Allis Chalmers WD45 Diesel knock solved
Date Posted: 03 Mar 2011 at 8:58pm

We pulled the head of the engine the other night, thinking it was a bad valve spring. We had a friend come down have a look and he found that number 6 piston is slightly striking the cylinder head. Just enough to leave an impression of the number on the piston top in the carbon in the cylinderhead. Now we have to tear it down further and determine the cause.

Replies:

Posted By: Chris/CT
Date Posted: 03 Mar 2011 at 9:16pm

If you need any parts let me know, lots of 45D engine parts looking for new home[s]

Posted By: MACK
Date Posted: 03 Mar 2011 at 9:20pm

Check for a loose rod beating on that cylinder. MACK

Posted By: Chris/CT
Date Posted: 03 Mar 2011 at 9:28pm

Good selection of Conn Rods ready to ship

Posted By: WD45Diesel57
Date Posted: 03 Mar 2011 at 9:52pm

we have to pull the pan and do some checking. do you think its stretched?

Posted By: Brian Jasper co. Ia
Date Posted: 03 Mar 2011 at 9:54pm

That's what I found on my D17D. Had 3 pistons hitting the head. Excessive milling on the deck of the block, probably to correct sleeve counter bores was what was wrong with mine. Check the piston stand out on all cyls. I don't know if it will be the same as the 262, but since they are very similar, the stand out might be the same. Spec on a 262 according to the original blue prints is .002 to .029. The compressed head gasket measured .055. The pistons hitting measured .060. All of my connecting rod wrist pin bushings were considerably worn on the beam side. It took a new block to fix mine right.

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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford

Posted By: WD45Diesel57
Date Posted: 03 Mar 2011 at 9:58pm

im hoping its nothing too serious, got my fingers crossed

Posted By: Eldon (WA)
Date Posted: 03 Mar 2011 at 10:02pm

Can't see how the rod would be stretched....I'd wire wheel the pistons and check the standout...then go from there. Maybe get out the angle grinder :-)

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Posted By: WD45Diesel57
Date Posted: 03 Mar 2011 at 10:05pm

thats what we were thinking if nothing is wrong in the bottom, we where told to shave the top of the piston

Posted By: Reeseholler
Date Posted: 03 Mar 2011 at 10:09pm

sounds like some wood will be knocking along with your engine

Posted By: Chris/CT
Date Posted: 03 Mar 2011 at 10:16pm

Sounds like a job for a belt sander, steady operator, problemo solved?

Posted By: TedBuiskerN.IL.
Date Posted: 06 Mar 2011 at 10:02am

I had the block decked .022 to correct the sleeve stand out problem, then had the pistons cut to match. Runs good. Utube/Matt Pehl, click on tractor going away with fat guy on left fender.

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Most problems can be solved with the proper application of high explosives.

Posted By: JC-WI
Date Posted: 06 Mar 2011 at 10:57am

Co8uld it be just carbom build up?

Maybe heck for con rod wear allow piston to hit on ex stroke, check rod bearing...

If lower pan comes off, might want to rering engine on all cyl .. Rod streatch? kind of doubt that, rod bent maybe. Gasket to thin to begin with, possible.