startup knock

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Mar 2, 2008 | 02:04 AM

'86_150

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Joined: Jan 2007

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From: Rochester Wa

startup knock

ok just yesterday my truck developed a knock. it only happens at startup for about 5 seconds then stops what could that be? thanks

Mar 2, 2008 | 04:55 AM

ozstang65

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Hydraulic lifter before it pumps up

Mar 2, 2008 | 06:04 AM

srercrcr

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I wouldn't characterize lifters as a knock, more of a loud clicking.
A knock could be engine bearings or perhaps piston pin. Try a lighter weight of oil, it should increase the flow a little, a needy bearing might appreciate it.

Mar 2, 2008 | 01:08 PM

'86_150

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From: Rochester Wa

im running 10-40 so do think 5-30 would work?

Mar 2, 2008 | 01:43 PM

mhg

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From: savannah,ga

what kind of oil filter are you using
frams are known for this

Mar 2, 2008 | 04:41 PM

srercrcr

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5 30 would be fine, especially at your latitude.

Mar 2, 2008 | 04:45 PM

Franklin2

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From: Virginia

Quote:

Originally Posted by mhg

what kind of oil filter are you using
frams are known for this

I would also change the oil filter. The anti-drain back valve inside may be leaking.

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Mar 3, 2008 | 07:30 AM

F3Beam

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I had a "Knock" on startup with my F100 one time. I do think it lasted a little more than 5 seconds though, increasing the rev increased the speed of the knock, and then it would go away. It was the main bearings.

Mar 3, 2008 | 08:42 AM

#10

ri_truck_guy

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Joined: Jun 2002

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From: Suffolk, VA USA

I had a similar problem with one of my old 300s. I kep the same weight oil, but switched to a synthetic blend. The knock went away and never came back.