Blog

Cummins ISX QSX Rear Crank Seal Procedure: M20147-A Professional Guide

By Blogdashfdhd Adminvsbgfsf • January 24, 2026

This 12-phase procedure uses the M20147-A kit to remove and install rear crankshaft seals & wear sleeves on Cummins ISX/QSX engines. Ensures precise alignment and depth for leak-free performance.

M20147-A Cummins ISX QSX rear crankshaft seal remover installer kit

M20147-A rear crank seal tool kit detailed view for Cummins heavy-duty engines

Introduction: Essential Rear Crank Seal Servicing for Cummins ISX/QSX Engines

Proper rear crank seal & wear sleeve service in ISX/QSX prevents oil loss. The M20147-A kit, 3164780 replacement, provides controlled extraction/installation—vital for durable repairs.

Phase 1-3: Engine Preparation & Removal

Drain oil and remove flywheel/clutch housing – Access rear seal
Clean crank flange – Remove old seal/debris
Inspect seal area – Note scoring/wear sleeve condition
Attach remover portion – Secure to seal/sleeve
Extract seal/sleeve carefully – No crank damage

Phase 4-6: Seal & Sleeve Preparation & Installation

Prepare new seal/sleeve – Lube lip & O-rings
Position on installer – Align concentric
Press seal/sleeve into housing – Even pressure
Seat to correct depth – Flush or spec
Remove tool – Verify flush seating
Inspect alignment – No gaps

Phase 7-9: Reassembly

CRITICAL: M20147-A Installation Setup

Reinstall flywheel/clutch housing – Torque spec
Refill oil – Check level
Prime system – No air
Start idle test – Monitor leaks
Document seal – Depth/torque
Reassemble components – All specs

Phase 10-12: Testing & Finalization

Road test load – Verify no drip
Final inspection – Clean/no leaks
Schedule follow-up – At 1,000 miles

Critical Safety Warnings: Seal Procedure

MUST AVOID THESE FATAL ERRORS:

❌ Never force removal – Scratches crank ($1.5K+)
❌ Never unclean flange – Contam ($2K+)
❌ Never uneven press – Misaligns seal
❌ Never dry lip – Tears seal
❌ Never omit lube – Wear
❌ Never skip depth check – Leaks
❌ Never ignore spec – Failures
❌ Never ignore PPE – Tool risks

Professional Service Documentation

Service Phase	Documentation Required	Complete?
Pre-Service	Crank inspection, seal condition	□
Removal	Extraction notes, crank photos	□
Installation	Press force, depth verification	□
Reassembly	Flywheel torque, oil level	□
Testing	Leak results, road test	□
Final Approval	Signature, warranty log	□

Why M20147-A Outperforms Improvised Methods

Risky Improvised Methods:

❌ Screwdriver removal → Crank scratches ($1.5K+)
❌ Manual press → Uneven seat
❌ 2–4 hour struggles → Labor losses
❌ Misalignment → Leaks
❌ No kit → Failures

M20147-A Advantages:

✅ Seal & sleeve complete
✅ 3164780 match
✅ 70% less rework
✅ Crank protection
✅ Protects $5,500–$14,000
✅ Heavy-duty
✅ Precision depth
✅ Shop ready

Service Rear Seals Professionally. Seal Cummins Engines. Maximize Reliability.

Get M20147-A – $352.08