Is it leaking oil or burning it? The valve stem seals might be dead (the #1 cause of oil consumption). Get a rocker cover gasket that is made from high temp silicon. Try 'Stone' gasket kits. Rumoured to be repackaged OEM parts. They are a mix of Ishino gaskets which is a company car manufacturers use as a supplier. Current prices on ebay are pretty good - https://www.ebay.com/itm/Mazda-B2600...dVtMgc&vxp=mtr
I'm leaking/seeping all around the VC. I'm regretting not having the seals changed when the head was off.Originally Posted by geezer101
It has always pushed some smoke when coming off of compression so the valve seals are suspect. At 230K would you think the guides will be worn enough to negate the benefit of fresh stem seals? Thanks for the tips on gasket mfrs.
Not necessarily. Unless the valves and seats are showing signs of wear from float, new stem seals will definitely go a long way into reducing oil consumption. It would have to be a fierce oil leak to lose 2.5 liters of oil from the rocker cover.
You may have misread my post. I had no VC leaks at 215K miles. It's always used some oil but is tolerable for my extra, dirty-work pickup. I avg. 2K miles a year.
Is it possible to change the stem seals without removing the head, by pressuring the cylinder? Never tried with an OHC motor! Might be mission impossible.
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