HD6G 344 valve spring broken
Printed From: Unofficial Allis
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=194530
Printed Date: 23 Nov 2024 at 4:41pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: HD6G 344 valve spring broken
Posted By: doctorcorey
Subject: HD6G 344 valve spring broken
Date Posted: 09 Apr 2023 at 11:15am
Well I got the loader out yesterday, and worked it for a while, and then I picked up this sudden miss, exhaust popping, and noise. Scoped it down to the number 3, and pulled the VC this morning. Broken exhaust valve spring, #3  . I suspect it was already compromised, but failed completely. I noticed that very little oil reaches the rocker shaft and valve springs. Is this normal, or do I have a sludged up line or such? My oil pressure is rock solid, even when hot and idling. Running 15w-40 Diesel oil. If anyone has valve springs they'd sell, shoot me a message. And, any advice on a method to hold the valve in place while I remove the spring. Also, I'd like to get one fuel injector (4346227)  for a spare and a play toy. My engine number is 6-10376 tractor 6-10873
------------- Semper Fi USMC 1958 HD6G, 1959 MF 203 loader, 1960 Case 420B Backhoe, MF 65 Tractor/Loader Diesel |
Replies:
Posted By: Codger
Date Posted: 09 Apr 2023 at 6:46pm
|
https://www.tractorjoe.com/parts/p/hc4336131-valve-spring-2/mt/industrial-construction/b/allis-chalmers/m/hd6b/g/engine-parts/" rel="nofollow - https://www.tractorjoe.com/parts/p/hc4336131-valve-spring-2/mt/industrial-construction/b/allis-chalmers/m/hd6b/g/engine-parts/ ------------- That's All Folks! |
Posted By: doctorcorey
Date Posted: 09 Apr 2023 at 9:28pm
------------- Semper Fi USMC 1958 HD6G, 1959 MF 203 loader, 1960 Case 420B Backhoe, MF 65 Tractor/Loader Diesel |
Codger wrote:Posted By: Codger
Date Posted: 10 Apr 2023 at 5:52am
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I don't have any Allis manuals. Found that via an online search. I wouldn't replace a single broken exhaust spring myself, but would replace them all. ------------- That's All Folks! |
Posted By: doctorcorey
Date Posted: 10 Apr 2023 at 8:44am
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Yes, I'm replacing all 8. Probably pull the head next winter and do a complete valve job. ------------- Semper Fi USMC 1958 HD6G, 1959 MF 203 loader, 1960 Case 420B Backhoe, MF 65 Tractor/Loader Diesel |
Posted By: gemdozer
Date Posted: 10 Apr 2023 at 12:52pm
| I should have 24 spring valves |
Posted By: DMiller
Date Posted: 10 Apr 2023 at 1:44pm
| Corey, If Memory Serves, or IIRC, there is ONE and ONE only Rocker Arm support or retainer bolt cut down for, that is the Lube Oil Supply off the rifling that feeds the head, is possible someone assembled incorrectly. |
Posted By: doctorcorey
Date Posted: 10 Apr 2023 at 5:01pm
------------- Semper Fi USMC 1958 HD6G, 1959 MF 203 loader, 1960 Case 420B Backhoe, MF 65 Tractor/Loader Diesel |
Posted By: gemdozer
Date Posted: 14 Apr 2023 at 11:25am
| I recheck this morning and found 3 injectors AKB 75S |
Posted By: doctorcorey
Date Posted: 19 Apr 2023 at 10:11pm
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Just for the sake of posterity, I am posting a part number for a valve spring that will substitute for the AC 344 engine, with either single or dual intake valve springs. Maybe it will save some one else the frustrating hassle of trying to find interchange numbers for this orphan spring. I ordered #474025242 from Ag Kits. Set of eight was around $60. They match the AC manual for installed height pressure, and pressure at lift .500. I didn't have a free length spec for the original, but the new ones have about .150" longer free length than the sacked out old Allis springs. Installed height pressure and pressure-at-lift are the real only important specs. On a side note, I received the springs on FedEx less than 24 hrs. after I ordered them. Impressive! Machine runs like a sewing machine now. ------------- Semper Fi USMC 1958 HD6G, 1959 MF 203 loader, 1960 Case 420B Backhoe, MF 65 Tractor/Loader Diesel |