plan9

 Hi again, I have found what I think is a small coolant leak from the head gasket at the front of the engine just under the exhaust manifold, I've now removed the head and it looks like the liners are under .0015" above the block.

 The fitted gasket was an MLS with a shim and seems to have lasted about 30000 miles but has been loosing coolant since I've owned the car. The original gasket was changed at around 60000.

 I have read that the elastomer gasket is best in this situation with low liners,  I'm thinking of fitting a head shim as well, but not sure if this will just give me another joint for problems down the line.

I going to be cleaning up the surfaces this evening to measure the faces more accurately and hope to order the gasket set tomorrow.

 Has anyone any experience with fitting the elastomer gasket with the MLS shim?

Thanks,
Neil


 

Hi, I have removed the inlet manifold from my TF 160 and around the head gasket joint  there appears to be some seepage of oil? It appears all round the joint. Is this likely to be the fire rings leaking a bit?

Thanks,
Neil

 

Thanks for that, maybe the emissions are ok after all and there is some kind of error with the original diagnostics,
I cant find any signs of a fault with the pscan (not that I am an expert on these things!)

Ill see what happens tomorrow at the MOT,

Thanks for the help,

From my old r45 Haynes manual (doesn't actually cover this model though) the figures are consistent with the CTS figures I have been getting from Pscan. Checking the average O2 sensor voltage on the same warm up I get 0.47v so close to the 0.45v that I think is the ideal value.

I think there may be a better way to approach this but I can't think of one at the moment. Any ideas welcome
Cheers,

So just warmed the engine up with the pscan logging CTS. it warms steadily to 89-90 deg and then stays put for a while I assume wile the thermostat lets the coolant through the rad. then steady warm to 104-105 deg when the fan cuts in, the fan cuts out again at around 97 deg. The dash gauge didn't get to half way.
Does this look about right or is the CTS reading a little hot?
any comments welcome,
Cheers,

Hi,
I am trying to use my pscan diagnose high CO emissions on my 98 R400 1.4

Fast Idle 0.669
2nd Fast idle 0.658
Nat Idle 0.801

Lambda and HC are ok.

The ECU goes into closed loop, the oxygen sensor voltage varies mainly between 0.1 and 0.8 and the temp sensor goes up, from memory ECU reads 90 dash is just under half way.

A couple of questions,
What is the 'normal' operating temp of the engine?
and if I were to average all the O2 sensor voltages should it be near 0.45v if its working correctly?

currently the engine seems to sit in the high 80s and my average voltages come to 0.35 ish

Cheers

Neil