Countries: CANADA, UNITED STATES Document ID: 1K1201391

* Availability: ISIS, IssiR Revision: 15
Major System: ENGINES Created: 8/25/2017
Current Language: Engish Last Modified: 7/19/2023
Knowledge Base Other Languages: Francais, Espafal, Author: Greg Schetf
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Title: Snap-On Torque Wrench Requirement for all Big Bore Engine Connecting Rod Bolt(s)
Applies To: A26 / MF13 / N13 / APR / Connecting Rod

Change Log

Please refer to the change log text box below for recent changes to this article:

c . P
12/06/2022 - Updated caution statement for bolt replacement
108/30/2021- Updated step 9 installation procedure.
408/17/2021- Updated article reviewing steps with Excel

Pig bore engines, waranty dates,

ks to shop & SRT manual.

None need

This article has been published to ensure proper operation of the Snap-On torque wrench for all big bore engine repairs related to connecting rod

torque. (A26 / N13A/.N13B / MF11/ 13)

$s

The Snap-On Torque Wrench is required for all repairs related to connecting rod replacement or engine overhauls.

mptom(s)

Required Tool(s)

Each service department was issued a Snap-On Torque Wrench and Digital Torque Wrench Checker

Tool Description Tool Number and Specifications
‘Snap-On Torque Wrench CTECH3R250A (12.5-250 ft-Ib) (16.9-339.0 Nm)
Snap-On (3/4")Torque Wrench Checker 6004-F-DDT (60-600 ft-Ib) (81.3-813.6 Nm)
Socket, External Torx (E18) ZTSE4835

Digital Torque Wrench Tester Set-Up

Tool Instruction: 4328553 Digital Torque Tester

Torque Wrench Set-Up

Torque wrench data is required for all big bore engine repairs WPL2800136.

Prior to torquing a connecting rod bolt validate torque wrench operation and calibration with
the Snap-On Digital Torque Wrench Tester.

Average battery life is approximately 80 hours. If the batteries have been removed or replaced
exceeding 20 minutes the wrench will default back to the o al factory settings.

+ Which ever occurs first the Snap-On torque wrench will require a calibration check at 5,000
cycles or (1) year by a certified Snap-On repair center.

Tool Instruction: 4328552 CTECH3FR250A Digital Torque Wrench Set-Up

For proper torque wrench operation ensure the following:
1. Clear previous torque wrench data
2. Check and set the correct date and time.

3. Check and set the correct present values:

[Nore

For the steps that follow, please make certain anytime the connecting rod bolts are
loosened, that the connecting rod cap remain properly seated to the connecting rod.
Failure to do so will result in rapid catastrophic engine damage.

4. (PSET 1) Target Torque: 22.0 ft/lb (30 Nm), Minimum Torque: 22.0 ft/lb (30 Nm), Maximum Torque: 23.0 ft/lb (31.1 Nm), batch (2).
+ Ifresults are above 25 ft/lb, loosen both of the rod bolts and retorque within the proper range

5. (PSET 2) Target Torque: 77.0 ft/lb (105 Nm), Minimum Torque: 77.0 ft/lb (104.3 Nm), Maximum Torque: 78 ft/lb (105.7 Nm), batch (2).
+ If torque results are above 80 f/Ib, replace both of the rod bolts and start at step 1

6. (PSET 3) Target Angle: 90 degrees, Minimum Angle: 90 degrees, Maximum Angle: 91 degrees, batch (2).

+ If torque results are 93 degrees or higher, replace both of the rod bolts and start at step 1

+ Verify the final torque value is within a minimum of 95 f/lb to a maximum of 150 f/lb. If any are out of range, replace both of the rod bolts and start at
step 1. Typically the final torque values for all 6 rods will be fairly consistant if done correctly
+ Maximum torque variance on a single rod is 20 ft/Ib. If that value is exceeded, replace both of the rod bolts and start at step 1

Installation & Repair Step(s)

+ Connecting rod bolts are torque to yield one time use.

+ Engine damage will occur if one or multiple connecting rod cap(s) are mismatched or installed backwards.
+ Do not use an impact to tighten connecting rod bolts.
+ Do not use any universal adapters and swivels during torque procedure.

+ Remove the oil pick up tube assembly for access.

+ Complete connecting rod torque sequence prior to rotating the crankshaft.

‘over-torqued at 93 degrees or greater, both bolts
must be replaced and the connecting rod cap has to be recentered. Premature
only one connecting rod bolt is repla

1, Review the appropiate engine service manual prior to disassembly and assembly.

2. Review general inspection procedure listed within the engine service manual prior to installation of engine components.

3. Clean all foreign material from the crankshaft journals and connecting rod assemblies.

4. Install one upper and lower connecting rod bearing, lubricate each with clean engine oil or Lubriplate #105.

5.A total of 2 new connecting rod bolts are required to complete connecting rod installation. Lubricate each of the bolt threads with 3 drops of clean engine oil (3-4 threads) and flange,

do not submerge
the whole bolt in oil, excessiv

ngine oil can cause a connecting rod bolt to hydro-lock during installation.

6. Ensure fractured surface is clean. Install the connecting rod cap making sure the cap is centered and installed correctly aligning marks with upper portion of the connecting rod.

7. Install both bolts into the connecting rod by hand. Complete tor: i's (1/6), (2/5) and (3/4)
Do not alternate between connecting rods during this process. (PSET1) 22 ft-lbs (30 Nm), arrow up, (PSET2) 77 ft-lbs (105 Nm), arrow up, (PSET3) 90 degrees.
Note: Recommend starting with cylinder #1 complete all (6) steps prior to moving to another connecting rod.

8. Repeat Steps 4-7 for the remaining cylinders
9, Its required to review torque wrench data (36 steps) prior to installation of the oil pan assembly to ensure proper torque values.

10. Continue to downloading torque wrench data

Viewing Torque Wrench Data
Torque wrench data can be viewed by downloading the .CSV file to a computer with an Excel based program or by viewing recorded data on the wrench.

(Correct amount of steps (36) recorded durin:

procedure)
G

DATE/TIME __TARGETTC MIN TORC MAX TORC PEAK TOR(TARGET AN MIN ANGL MAX ANGI PEAK ANGITORQUE UTORQUE S_ANGLE STA MODE COUNT

Bag 5/3/2021 12:06 22 22 23225 0 0 0 OFTIB OK OK 1
8/1/2021 12:06 22 22 23223 ° ° ° OFTLB OK oK 2

BM 8/1/2021 12:06 7 7 7 774 ° ° ° OFTLB Ok oK 1] Cylinder
18/1/2021 12:06 7 7 7775 ° ° ° OFTLB OK OK 2) ma

El 8/2/2021 12:06 ° 0 2751457 90 90 91 90 FT-B OK oK 1