Major Service

Overview of the VR-4 Major Service

The major service on the VR-4 is considered to be the biggest and most complex service with the following details:

Frequency	Core Tasks	Optional Tasks
Every 100,000km	Replace Timing Belt Replace Water Pump Replace Coolant Replace Timing Belt Tensioner Replace Timing Belt Tensioner Pulley	Replace camshaft oil seals Replace crankshaft oil seal Replace harmonic balancer Replace alternator belt Replace AC/Power steering belt Bleed Brakes Replace Transmission/ATF fluid Bleed Clutch Replace Transfer Case fluid

Required Tools

The tools you will need for the major service will depend on whether you are performing just the core service or all of the optional tasks. We list the tools here for each, plus alternative tools (where possible) if you do not have the recommended tool.

Tools for Core Tasks

Tool	Purpose	Alternatives	Notes and examples
1/2" socket set	Removal of various bolts	Spanners (if you're a mad lad).	Socket set will need to include 10mm through 17mm, and 19mm through 21mm. Many of the
3/8" socket set	Removal of various bolts in the harder to reach places	Spanners or trying to do it all with a 1/2" socket set
Open and ring spanner set	Removal of bolts and nuts that cannot be reached with sockets, or holding nuts on the other end of bolts you are removing with the socket set.
Camshaft sprocket holder	Inserting into the two guide holes to hold the crankshaft pulley (harmonic balanacer) while you remove the bolt.	Breaker bar inserted into harmonic balancer bolt head, followed by tickling the starter motor	Whilst this is a cam sprocket holder, the 6A13 harmonic balancer has two guide holes that allow use of this type of tool. The Mitusbishi service manual specifically mentions tool MB990767 and the right size pins (MD998715) for holding the pulley.
Very powerful 1/2" impact gun	Removal of harmonic balancer bolt	Breaker bar	If restraining the harmonic balancer using a cam sprocket holder, the impact gun needs at least 1,500Nm of nut busting torque. If you do not have such a tool, you can try a breaker bar.
Small 10mm open ended spanner	Removal of the timing cover bolt behind the Power steering pump bracket	Removal of the power steering pump bracket before accessing this bolt.	Seriously, this one bolt will make you rage.