200tdi cyclone breather question - Defender Source
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  #1  
Old March 23rd, 2014, 02:36 PM
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Mack Crouch
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200tdi cyclone breather question

I have an oil leak at the rocker cover on my 200tdi. I have renewed the rocker cover gasket with no change in the leak. It's definitely coming from the rocker cover and not from the o ring at the breather, etc. I also made sure it wasn't over torqued when installed. Compression is around 340psi per cylinder with no more than about a 7% difference between cylinders. These numbers are not as high as some 200tdi's I've seen which is usually 400+ psi. True mileage of the engine is unknown however the truck pulls great and does not smoke excessively.

I wanted to check the cyclone breather and I followed the instructions in the workshop manual. Attached is a picture of the instructions. It says to draw a vacuum from the bottom hole and to plug the two upper holes. It states that unplugging either of the two upper holes should release the diaphragm and the pressure. I made sure it was clean before testing. I can only get vacuum to build if I plug both upper holes, which seems normal. However, I can only get the pressure to release if I unplug the hole going into the rocker cover; unplugging the hole that goes to the intake changes nothing. Is this how it is supposed to operate, or is the breather potentially bad? Thanks for any help.
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  #2  
Old March 24th, 2014, 12:06 PM
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Mack Crouch
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Anyone?
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  #3  
Old March 24th, 2014, 12:08 PM
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Jason Rose
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I have an extra if you need one
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  #4  
Old March 24th, 2014, 06:06 PM
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Quote:
Originally Posted by jrose609 View Post
I have an extra if you need one
Thanks. Any chance you could vacuum test yours to see if it operates the same as mine?
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Old April 3rd, 2014, 02:07 AM
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Mack Crouch
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Well I tested a new breather and it works the same as mine. The testing instructions in the manual weren't entirely accurate. Looks like my breather isn't causing the excess crankcase pressure/rocker cover oil leak. Anyone have any other ideas to test before I assume excessive blow-by due to worn piston rings and/or cylinder bores?
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