Join Date: Nov 2002
Location: BC Canada
Feedback Score: 0 reviews
Re: Worn valve guide... I need some moreconvincing!! lend me your thoughts...
I have seen this before and the guide is completely shot. When you are running it the cam pushes the valve open and the exhaust is not only going out the manifold it is coming up the valve stem and into the crankcase (is your rear main leaking?). That is where that 'grainy' crud is coming from, it's oil that has been burnt by the hot exhaust. With that much guide clearance it will most likely be allowing oil into the cylinder which will burn during combustion. Depending on the amount of oil the cylinder temps can go up significantly since oil has a higher BTU rating than diesel fuel. The spring may or may not be broken but the one I know of had been run so long and hard it appeared the temper was gone from the spring due to the excessive heat (may or may not be the case).
Sorry my friend but the only thing that I can see from this information is the head(s) need to come off. I'm sorry I have not been following any previous threads, how has this thing been running lately, just a miss/tick or other symptoms?
For every action there is an equal and opposite malfunction
1988 F350 CC 4x4 SRW, 7.3 Banks non-wastegated turbo, C6 w/ HD torque converter, Tru-Cool 4590 trans cooler, Highjacker 'softride' 4" lift, pre/post luber, coolant filter, Racor fuel filter/separator, pyro and boost gauges, Progressive 16x8 wheels, 285-75x16 rubber, 3" downpipe into 4" straight pipe over the rear axle and into 5" SS tip. 1994 Alpenlite 33' 5th wheel trailer