Best and Worst years of the 372 x-torq (aka what design changes)

[FernGreen]

This is a bit of technical research. Looking for information on years to be cautious of when buying a used 372 XT. I tried surfing through afleetcommand’s YT channel because I could’ve sworn the first couple years of the XT were problematic with crank balance issues. However I can’t find any information now in regards to It. Anyone here have a list of design changes that the XT underwent during production so far?

 

[bwalker]

The durability of the bearings with the XT isnt what it was with the OE 372. I dont think that has ever changed, but they certainly have less catastrophic failures than the early XT models.

Thread 'Dead Husqvarna 372 X-Torq strategies'

Nov 29, 2019

A topic that is sure to draw fire, of course that is the spice of life right? First a back drop, there were a few years the X-torq 372's seemed to like to eat their PTO side bearings and bearing pockets.... WHICH Husqvarna addressed obviously as that NO longer ( after 2016? 17?) seems to be a problem. A few things seem to have been changed like wrist pins and cranks to balance things better? But to the subject. WHAT to do when you see a 372 XT that won't idle, runs lean, all the things common to those saws. First obviously diagnose the issue! Often the back to basics approach reveals...

• afleetcommand
• Replies: 8
• Forum: Shop Projects

 

[Ketchup]

There are some slight case changes over time. I’ve had a few random halves that didn’t line up together. That may be related to the spun bearing fix. I always assumed the changes happened in the first few years of production.

XT’s are pretty hardy saws though. If I was picking one up used I would be more concerned about what that particular saw had been through rather than year of manufacture.

 

[bwalker]

Running more oil helps with the bearing issues according guys I trust. If I owned one it would see nothing but 32:1 with Dominator or Maxima K2.

 

[FernGreen]

Alright so here's what I found for design changes according to the factory service bulletins. Looks like most of them were implemented around 2011?
SB, Crankcase, 372XP/365 X-TORQ, 2011-03
An adjustment for a longer 372XP/365 X-TORQ cylinder flange has been carried out in the crankcase. New part number. Full interchangeability is not available.
- crankcase with part number 503 62 68-76 can only be used with the 365 Special, 372XP models.
- crankcase with part number 503 62 68-08 can be used for all 365 Special, 362, 372XP, 365X-TORQ, 372XP X-TORQ models.
Introduced from serial number: 101500001

SB, Piston, 372 XP, 365 X-TORQ, 2011-05
A reinforced piston has been introduced into production. At the same time the cylinder complete gets a new part number. There is full interchangeability.
New part no. Excl. part no. Description: Remarks:
575 25 57-02 575 25 57-01 Cylinder complete 372XP X-TORQ
575 77 41-02 575 77 41-01 Cylinder complete 365 X-TORQ
577 20 77-02 510 44 39-02 Piston complete
Introduced from serial number: 111400001

SB, Ignition system, Carburetor, 372 XP, 365 X-TORQ, 2011-06
A digital ignition system has been developed to replace the previous analogue system A digital ignition system makes it possible to adapt the ignition curve for each rpm range. The digital ignition system can only be combined with the following carburetors. Full interchangeability is not available.
Carburetor: A recalibration of the RWJ 4 carburetor has been carried out to improve its idling features. The recalibrated RWJ 4A carburetor replaces the previous production model. As a spare part, the new RWJ 4A carburetor can only be combined with a digital ignition system according to the above. Full interchangeability is not available.
New part no. Description: Excl. part no. Remarks:
522 79 54-03 Ignition system 372XP, 365 X-TORQ COT 510 11 57-01 *
577 65 78-01 Carburetor RWJ 4A 372XP, 365 X-TORQ 522 85 87-01 RWJ 4 *
* is still available as a spare part for previous models.
Introduced from serial number: 372XP/365 X-TORQ 112100001
Carburetor settings for speed limited ignition system:
A new procedure is applicable when adjusting high speeds due to the speed limited ignition system. Read more below. The engine is adjusted for sea level in the factory. When working at a high altitude or in different weather conditions, temperatures and atmospheric humidity, it may be necessary to make minor adjustments to the high speed jet. NOTE! If the high speed jet is screwed in too far, it may damage the piston or cylinder. When the high speed jet is tested in the factory, it is set so the engine can comply with current regulations while at the same time achieving the best possible performance. The carburetor's high speed jet is then locked using a movement limiter in the fully screwed out position. The movement limiter only allows the setting of the high speed jet to a maximum of half a turn. NOTE! An inbuilt speed regulator in the ignition system limits the top speed to 13,300 rpm. The speed will not exceed 13,300 rpm when the high speed jet is adjusted (screwed in). When the speed regulator is activated, you will get the same sound experience as when the chain saw runs as a 4-stroke. NOTE! As the ignition spark is blocked, the revolution counter will not show speeds greater than 13,300 rpm.

SB, Muffler support, 372XP, 372XP X-Torq, 365, 365 X-Torq, 365H, 2013-01
The muffler support has been reinforced. New part number. There is full interchangeability. New part no. 579 02 59-01. Excl. part no. 503 76 65-03.
Introduced from serial number: 20124600001

 

[pbillyi69]

what a hastle to figure all of that out

 

[Woodslasher]

At one point I was frankensteining a 371, 365 X-torque, and 372 XPW and all three had different pto case halves. The 371 had little to no webbing inside the oil tank, the XPW had some, and the 365 had the most re-enforcement.