Oil Pump Relief Valve

[johnbuz]

Hi

 

In the last six months I have repaired two '97 Petrol 2L 8V DOHC galaxy's.

 

They both had very noisy cam chains, the first had destroyed the side guide and the chain had actually machined its way thro the block, oil everywhere.

 

The second also had very noisy cam chain, and had manged to destroy the side guide, but no block damage.

 

On both these engines the oil pressure relief valve on the side of the oil pump had undone itself to the extent that the torx bolt holding the valve spring in place had backed out to touch the inside of the block.

 

So I guess the cam chain failure was caused by the oil pressure dropping, thro' lack of spring pressure on the relief valve, the cam chain tensioner relaxing and allowing the chain to whip about thus destroying the guides and causing excessive chain stretch.

 

Has anyone else seen this in the 2L 8V lump?

 

Both engines now run as sweat as a nut, a bit of 'JB Weld' cured the block hole in the first, and a complete replacement of chain and guides etc cured the rest. Oh and tighten , with thread lock, the pressure relief valve bolt on the oil pump!

 

John

[tim-spam]

Glad I've got a cambelt...

[nikitz77]

Hi

I had the same problem. Very noisy chain - the sound was caused because broken big chain guide. The fully opened hydraulic valve was the main reason for the failure. The pressure relief valve was in order. After installing new chain, big and small chain gide, hydraulic valve and arm, gaskets and oil the engine works like new. It is very usefull to have TIS. It takes me 1.5 days to finish the repair. Instead the speacial tool for the crankshaft nut you can use pneumatic nut tool.

 

PS Before that the oil lamp worked strange. After starting the engine it turns OFF, after 1-2 sec lights ON for few second and turns off. After that there were no more problems with the oil lamp.

 

 

Nikolay

Edited May 10, 2011 by nikitz77