Skip to content
8–23 August: reduced summer staffing. Orders may take up to 5 extra working days to dispatch and emails up to 2 working days to answer. Thanks for your patience.
8–23 Aug: orders may ship up to 5 days later.
RTC171820 - Bearing Set 020 Main by Allmakes Land Rover Range Rover

RTC171820 - Main Bearing Set – V8 – 0.020"

- €31,20
€31,20
€31,20 - €31,20
€31,20
Aftermarket Part
Aftermarket: Quality alternative. This is a quality alternative, designed to fit and function like the original part, often at a more competitive price.
Main Bearing Set - 0.020in Undersize - crankshaft main bearing shells for the 3.5 and 3.9 litre V8 petrol engine, sized for a crankshaft that has been reground 0.020in undersize on the main journals.

The main bearings carry the crankshaft in the cylinder block, forming the running surface between the crankshaft journals and the block and main bearing caps, and maintaining the oil film that supports the crank under load.

The undersize grade must match the regrind of the crankshaft. Fitting a grade that does not correspond to the journal size leaves either insufficient running clearance, which starves the bearing of oil, or excessive clearance, which drops oil pressure.

Supplied as a complete set for one engine.
Vehicle Model Land Rover Defender up to 2016
Land Rover Discovery 1 1989-1998 (L318)
Range Rover Classic up to 1994
Land Rover Series 2 and 3
Fitment Notes Crankshaft main bearing set, 0.020in undersize (JLR comment: 0.020 U/S). Qty 1 per engine.
DEFENDER 1987-2006 — 3.5L V8 Twin Carb Petrol
DISCOVERY 1 1989-1998 (FA393361 to WA799999) — 3.5L V8 Twin Carb Petrol; 3.9 EFI Petrol (high & low compression, manual & automatic)
RANGE ROVER CLASSIC — V8 Twin Carb & V8 EFI Petrol; 1986-1991 to VIN HA610293, 1992-1994 from VIN JA610294
SERIES III — 3.5L V8 Petrol (Stage One V8) only
Alternative Codes
RTC171820

Available to order 2–3 weeks

Not currently in stock. Order now — typically ships within 2–3 weeks.

Need it faster? Contact us about express import (2–5 business days).

When will my order arrive?

This item is ordered from our supplier on request. Typical lead time is 2–3 weeks from order confirmation.

  • Netherlands / Belgium / Germany: 2–4 working days after dispatch.
  • Other EU countries + UK: 4–8 working days after dispatch.
  • Outside EU/UK: contact us for an estimate.

Need it faster? Express import available in 2–5 business days — contact us before ordering.

Job kits containing this part

This part is included in 0 job kit(s) below. Pick the kit that matches your vehicle and job, then add what you need.

Frequently asked questions

What is the RTC171820 main bearing set used for?
The RTC171820 is a crankshaft main bearing set for the Rover 3.5L V8 petrol engine, ground 0.020in undersize. It fits Defender, Discovery 1, Range Rover Classic and Series III Stage One V8 applications when the crank has been reground.
What does 0.020in undersize mean?
0.020in undersize means these main bearings suit a crankshaft reground 0.020in smaller than standard on the main journals. Order this size only if your V8 crank has been machined 0.020in undersize, otherwise the bearing clearance will be wrong.
Which engines does this main bearing set fit?
This 0.020in main bearing set fits the 3.5L V8 twin carb petrol in Defender (1987-2006), Discovery 1 (1989-1998), Range Rover Classic and the Series III Stage One V8. It's one set per engine covering all main bearing positions.
Why replace the main bearings?
Main bearings are typically replaced during a V8 engine rebuild or when the crankshaft is reground. Worn main bearings can cause low oil pressure and a deep knocking noise. Matching the bearing size to the reground crank journal is essential for correct clearance.