Description
Interstate McBee Expansion / Welch Plug Kit
Includes freeze plugs for the block, cylinder head alignment dowels on 89-98 3.9L & 5.9L Cummins diesel engines.
Can identify non storm block by 4 freeze plugs on side of block under exhaust manifold
Includes;
3027646 – Plug, Exp, Cyl Block, B & C X 1 EA
3922072 – Plug, Expansion, B, 6C X 6 EA
3007635 – Plug, Expansion, 1″, Stls Steel X 4 EA
3900956 – Plug, Expansion, Cyl Block, 6B X 3 EA
3900687 – Plug, Expansion, Cyl Block, 6B, X 1 EA
3900955 – Plug, Expansion, Cyl Block, 6B X 2 EA
3900958 – Plug, Expansion, Cyl.Block, 6B X 1 EA
3902343 – Ring, Dowel, Cyl Block, 4B, 6B X 2 EA
Shipped Australia-Wide
- Dispatched from within Australia with tracking.
- Same-day dispatch on in-stock orders placed before 11am AEST, Monday–Friday.
- Shipping is calculated at checkout based on size, weight and your delivery address.
- Estimated delivery 2–7 business days depending on your location.
Freight question? Call us on (07) 5619 7869.
Interstate McBee Expansion / Welch Plug Kit Includes freeze plugs for the block, cylinder head alignment dowels on 89-98 3.9L & 5.9L Cummins diesel engines.
Double Duty Diesel — Manufacturer Pass-Through Warranty
Double Duty Diesel parts carry the original manufacturer's warranty:
- Fluidampr — Lifetime warranty on harmonic balancers
- MAHLE / Clevite — 12 months on bearings, gaskets, sealing components
- Dynomite Diesel — 12 months on stock-spec injectors and pumps; performance/race spec varies
- Power Driven Diesel — 12 months on turbos and bundled tuning kits
- Returns must be notified within 30 days of delivery
- Parts only — installation not covered
Workshop fitment available at Willys for transmissions, injectors and engine internals.
Read the full Double Duty Diesel warranty terms →
Warranty claims are coordinated through Willys Workshop. Email sales@willysworkshop.com.au or call Warana (07) 5619 7869 / Oxley (07) 3377 3421 with your order number and a description of the issue.
