Toyota 22RE Timing Chain

The 22RE is a legendary Toyota engine.  Used in many of Toyota’s smaller pickup trucks this engine has longevity to spare (what Toyota engine doesn’t?).

Despite its great reputation and low maintenance it isn’t perfect.  After years of service the timing chain will start to loosen and contact the chain’s cover.  Below are pictures from a 1993 Toyota pickup truck with over 230,000 miles on the clock.  As you can see by the dark oil deposits on the inside of the cover this engine worked hard for its living.  The track you can see on the inside lip of the cover is the machining of the cover by the loose timing chain.  If left too long this would have worn its way into the cooling jacket of the engine.  This would have caused the coolant and oil to mix and ultimately would have destroyed the engine.

When caught early enough a new timing chain kit will solve this problem and will give the engine countless more miles of service.

Toyota 22RE Timing Cover Damage

 

New Timing Gear Installed:

New Timing Chain Installed - Toyota 22RE

 

 

Volkswagen 2.8L VR6

This is engine work on a 2002 Volkswagen Jetta VR6.  The VR6 engine is a brilliant engine design where the cylinders are in a ‘V’ design but the engine still only uses one cylinder head, instead of the traditional two heads that all other V engines use.

The ‘R’ in VR6 stands for ‘narrow angle’.  Rumor is that VW jumped on this when the patent for this design expired.  The VR6 first saw production in the VW Corrado, followed by the GTI.  It recieved mass acclaim from the automotive news press and was considered by many to have saved the hot-hatch market segment that was basically invented by VW’s first GTI – marketed in the US as the Rabbit GTI.

Here’s the cylinder head – it isn’t much bigger than an inline four cylinder:

VW VR6 Cylinder Head

Here’s the engine block:

VW VR6 Engine Block

Note here that it is mounted transversely in the Jetta and again isn’t much bigger than a four-cylinder.

 

A common service challenge with the VR6 is the timing gear.  This engine came apart because it had blown a head gasket from overheating.  However, like many VR6’s with some milage on it, the timing chain guides were damaged.  If left unrepaired this would likely have caused timing chain failure and severe engine damage.

Here’s a shot of the old and new rear guide:

VW VR6 Broken Timing Chain Guide

 

The complication with this engine design is that the timing chain is on the REAR of the engine.  So, to service the chain requires removal of the transmission.

 

Here’s the new guide in place.  Notice that the timing gear consists of two chains – an upper (hanging loose in this picture) and the lower.

VW VR6 Timing Chain and Guide

Notice the new (clean) upper chain guide installed?  The really unfortunate part about this design is that, to replacd this guide, the lower chain cover has to come off the engine.  This requires removal of the transmission and either the flex plate (automatic transmission cars) or the clutch and flywheel (manual transmission).

 

Here’s some shots of this engine going back together.

 

Head Gasket Installed:

VW VR6 Head Gasket

Head installed – notice the camshafts and the timing chain.

VW VR6 Camshafts

Here’s the head before installation of the intake manifold:

VW VR6 Intake Removed

 

Here’s the lower intake installed (with Fuel Injectors):

VW VR6 Lower Intake

 

Here’s the Upper Intake Installed (Starting to look like an engine again!):

VW VR6 Upper Intake

 

This particular VR6 is the simplier of the two main designs that VW made.  This one only has one camshaft per cylinder bank so it is technically a single-overhead-cam design (even though it ‘looks’ like a double cam design).  VW also made a double overhead cam version where the engine has a total of four camshafts.

Other derivatives of this engine design include the W design where two cylinder heads, both using narrow-angle pistons, are used.  This design made it into the W8 Passat.  There are also exotic W16 engines and other high power designs made by VW.