Buy wp20451 - Genuine Cummins Gear Housing - wisentpartscenter.com

Description

Genuine Cummins 3991069 Gear Housing forms the front structure around the engine timing gear train on Cummins 5.9L applications. It keeps the crankshaft, camshaft, fuel-pump drive, and related gears correctly positioned while providing the mounting surface for the front gear cover and timing components.

Key Functions
- Supports and aligns the front timing gear train.
- Provides mounting points for the timing pin, front cover, and related gear-drive components.
- Keeps the gear train enclosed and correctly positioned against the engine block.

Verify fitment with us before ordering to ensure the correct part for your application.

Purpose of the Part

The 3991069 gives the front timing gears a rigid, accurately positioned housing so the crankshaft, camshaft, and gear-driven components stay in the correct relationship. Proper housing alignment is important because even a small change in gear position can affect timing, gear mesh, and component life.

Issue Symptoms / When to Replace

A damaged gear housing may show cracks, broken mounting bosses, damaged threads, oil leakage at the block-to-housing joint, or wear around timing and accessory mounting points. Abnormal gear noise or repeated front-cover sealing problems can also justify inspecting the housing, but the gears, shafts, gasket surfaces, and fasteners should be checked at the same time.

Brand Information

Cummins has manufactured diesel engines and engine components since 1919 and supports its B-Series engines with dedicated internal and external service parts. On the 6BT 5.9L, the front gear housing is part of the engine’s mechanical timing system and supports the components that keep the camshaft, crankshaft, and fuel-system drive synchronized.

Installation Notes

Make sure the block mating surface, locating points, and housing are clean and undamaged before installation. Use the engine-specific Cummins procedure for gasket installation, housing alignment, and fastener torque.

How to Identify an OEM Part

The OEM housing should have a permanent Cummins casting or part number molded into the metal.

Why Buy 3991069 from Wisent Parts

  • ⏱️
    Fast shipping
    Orders before 12PM EST ship same business day.
  • 🛡️
    180-day warranty
    All parts covered from delivery date.
  • ↩️
    Easy returns
    30-day returns.
  • ✅
    Verify fitment
    Send VIN/ESN and we’ll confirm.

Shop with confidence

Warranty & Return Information
Warranty Information

Wisent Parts offers a 180-day warranty on all parts from the date of delivery. This warranty covers orders placed directly through our website. If a part fails during this period, we’re here to help - whether it’s a replacement, repair, or refund. For full details, refer to the Warranty page.

Return Information

Wisent Parts accepts returns within 30 days of delivery. All returns are subject to a restocking fee. To qualify, parts must be unused and in their original condition. For full return instructions and restocking fee details, please refer to the Returns page.