Home - Return to Previous Page
Click on image to zoom

Gear Compatible With Cummins 4B3.9/4Bt/6B5.9 1983-1998 4B/4Bt 3.9L (4B) 36T Crankshaft Gear

C3901258A1
OEM PART NUMBERS:
• Cummins: 3901258 (Primary OEM part number)
• Cummins: 3929027 (Interchangeable cross-reference)
• Cummins: 3906701 (Cross-reference number)
• PAI: 171716 (Aftermarket cross-reference)

SPECIFICATIONS:
• Teeth Count: 36
• Gear Type: Crankshaft Gear
• Position: Crankshaft
• Engine Family: B-Series
• Displacement: 3.9L
• Condition: New

APPLICATION:
• Compatible with Cummins 4B3.9/4BT (1983-1998)
• Compatible with Cummins 6B5.9/6BT (1989-1998)
• Compatible with Cummins 4BTA/6BTA (1998-2007)

PRODUCT NOTICE:
As a parts distributor we mostly sell aftermarket parts (any OEM parts would be noted as such). Aftermarket parts are not sourced from the original vehicle or equipment manufacturer, but are designed to function the same as - if not better than - the original. All parts sold are new.

WARNING - This product may expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov

Was: $161.63
Sale: $92.36
Save: 43%
Save: $69.27
Qty:
Free Shipping!

Description

CUMMINS:
• Cummins 4B3.9/4BT 4B/4BT 3.9L (1983-1998)
• Cummins 6B5.9/6BT 6B/6BT 5.9L (1989-1998)
• Cummins 4BTA/6BTA B-Series Turbo Aftercooled (1998-2007)


IMPORTANT:
36-tooth crankshaft gear for Cummins 4B/4BT (3.9L) and 6B/6BT (5.9L) B-Series engines. Cross-refs: 3929027, 3906701, PAI 171716. Fits both naturally aspirated AND turbocharged variants. This is the master timing component — drives camshaft, injection pump, and oil pump gears.

Covers all B-Series engines from 1983-2007. When replacing, ALL timing marks must be aligned — one tooth off causes valve and injection timing failure. The crank gear press-fits onto the crankshaft nose. Inspect keyway for wear. Replace front seal and all gaskets. While the gear train is accessible, inspect all mating gears for wear.

⚠️ Master timing gear. Fits 4B/4BT and 6B/6BT. Align ALL timing marks.

Details

Categories

Shipping Information

  • Item Requires Shipping
  • 1.9 lbs.
  • W6.0000” x H3.0000” x L6.0000”
  • Free Shipping!

Customer Reviews

Comment Total Reviews (0)

Write the First Review!

You must login to post a review.