1999 Ford F-150 Valve Knock, radical oil presure

GLENM

MEMBER
1999 FORD F-150
V8
4WD
AUTOMATIC
289,000 MILES

Truck running great, took to mechinic for new waterpump. Mech said bolt broke off in block. Said while at it need to replace timing chain and gear as they are origional. All work done to a nice tune. Truck starts fine, when engine gets to operating temp the oil pressure guage goes nuts, loud knocking in top of engine and loss of power. Took it back three times discribing problem shop related they could not find anything wrong. My guess is I got screwed and did not get kissed. I suspect I will need to replace the engine. Your thoughts?

Thank you.

Fustrated in Colorado

2 Replies

INDYUKE

MECHANIC
416 POSTS

It's hard to say whether you were taken advantage of or not. Did they remove the broken bolt out of the engine block and replace it. As well as cleaned out the rest of the bolt holes of any corrosion. That's just part of professionalism.

Sometimes in removing and replacing the timing set, a little coolant will get into the oil pan and dilute the oil. Have you checked or changed the oil after the work done? If you find a lot of water in the oil, that could explain your inconsistant oil pressure. Let us know.

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Thursday, January 17th, 2008 AT 8:14 PM

FLEXY5

MECHANIC
512 POSTS

This is a V8 which means it's either a 4.6 or a 5.4. Either way, this is not a typical timing setup. If it's not done correctly it will destroy the engine. This is a zero clearance engine. There is an entire tool kit designed to line up the cams and the crankshaft. Plus the chain guide tensioners are oil fed and controlled by oil pressure. I don't want to say that he didn't know what he was doing, but there is definetly something he didn't do right. If you have any further questions, feel free to ask or you can PM me.
Dave

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Thursday, January 17th, 2008 AT 8:27 PM