Volkswagen Workshop Service and Repair Manuals > Golf Mk6 > Power unit | 4-cylinder diesel engine (1.6 l engine, common rail) | Engine lubrication | Engine oil cooler

Checking engine oil cooler for leaks

Special tools and workshop equipment required

t	Refractometer -T10007-

t	Hose clips up to 25 mm Ø -3094-

t	Cooling system tester -V.A.G 1274-

t	Adapter for cooling system tester -V.A.G 1274/8-

t	Spring-type clip pliers -VAS 5024 A-

t	Drip tray for workshop hoist -VAS 6208-

t	Torque wrench -V.A.G 1331-

Not illustrated

t	Expansion tank -1K0 121 407 A- or expansion tank -1J0 121 407 B-

t	Plug -191 211 343-

t	Cap -1J0 121 324-

t	Coolant hose -251 265 056-

Prerequisites:

l	Engine cold

Test procedure

–	Remove noise insulation tray → General body repairs, exterior; Rep. gr.50.

–	Drain coolant → Chapter.

–	Loosen hose clips on engine oil cooler using spring type clip pliers -VAS 5024-.

–	Remove engine oil cooler with housing → Chapter.

Note

t	Collect escaping coolant with drip tray -V.A.G 1306- or drip tray -VAS 6208-.

t	Collect leaking engine oil with a cleaning cloth, if necessary.

Checking when removed

–	Clamp housing with old seal on a suitable, level clean surface.

–	Secure sealing plug-2- to breather connection of expansion tank -1-.

–	Secure coolant hose -3- to engine oil cooler and expansion tank.

–	Fill expansion tank up to „Max“ marking.

–	Attach cooling system tester -V.A.G 1274- with cooling system tester adapter -V.A.G 1274/8- to expansion tank.

–	Use hand pump on tester to create a pressure of about 1.6 bar.

–	Watch pressure drop on pressure gauge. A pressure drop within 10 minutes is not permitted.

If pressure drops:

–	Renew engine oil cooler → Chapter.

Installation is carried out in the reverse order. When installing, note the following:

–	Renew seal for housing.

–	Check coolant level, replenish coolant if necessary → Chapter.

–	Check engine oil level, replenish oil if necessary → Chapter.

Volkswagen Workshop Service and Repair Manuals