Re: Ford F150 buring oil

Posted by Jon Hagen on December 17, 2005 at 15:53:50 from (69.26.17.171):

In Reply to: Re: Ford F150 buring oil posted by Hurst on December 17, 2005 at 10:38:13:

Compression on all cylinders will be within 10% of each other if rings and valves are OK. If the bonnet type valve seals are bad it will allow a lot of oil to be sucked down the valve guides and into the cylinders.
To change the valve seals without removing the heads,you make or buy an adapter fitting that allows you to attach your air compressor to the spark plug port. 100 psi of air pressure in the cylinder will keep the valves tightly seated,which will allow you to carefully compress the valve spring and remove it and the valve retainer,so you can replace the valve seal. You can get several types of lever type or captive spring compressors that allow you to compress the valve spring without anything contacting the valve head. You need to use care that you dont accidently push a valve open and lose the air pressure in the cylinder,if you do you face the real danger of dropping a valve into the cylinder. If that happens,you WILL have to remove a head :(. I have used this method many times with good results,allows you to replace valve seals with only removal of the valve covers and rocker arms.

Replies:

• Re: Ford F150 buring oil Jon Hagen 16:04:07 12/17/05 (0)

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