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Old 05-13-2011, 08:59 AM   post #16 of 25
Ingersoll444
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Default Re: Knocking Engine... 351W

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Originally Posted by johninMd View Post
Must be the summer for fords, just diagnosed my nephews 86 F250 with a 300 six in it, 2 adjoining cylinders have 50 lbs compression.. He isn't happy..
Thats probably not a bad fix. easy engine, and may just need a head gasket.
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Old 05-13-2011, 09:00 AM   post #17 of 25
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Default Re: Knocking Engine... 351W

Wow... this truck won't give it up haha oil pressure is suffering further. Im taking it to a friend of mines father who has a lift and has built several engines. I think were going to do a bearing job, or whatever he thinks is wrong with it. I just need it to last until the end of summer and wan't to fix it before it gets worse... Should i replace the oil pump? I have a budget of about 200 bucks so i cannot go all out on this thing... i am not pulling the engine. Its in a lifted 1986 ford with ttb so it is possible but not easy.
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Old 05-13-2011, 09:10 AM   post #18 of 25
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Default Re: Knocking Engine... 351W

Yes change the oil pump!!!!! Wile your in there, spend a few bucks and get a aftermarket oilpump drive also. You do not want a high valume pump... they dont fit in the truck oil pans. Ive always used Melling pumps in mine, but any good normal valume normal pressure pump will be fine.
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Old 05-13-2011, 09:11 AM   post #19 of 25
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Default Re: Knocking Engine... 351W

Ok i will do that. is it something NAPA can get along with the bearings??
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Old 05-13-2011, 09:18 AM   post #20 of 25
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Default Re: Knocking Engine... 351W

Any real parts stores should be able to hook you up
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Old 05-13-2011, 09:43 AM   post #21 of 25
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Default Re: Knocking Engine... 351W

ok good. thanks.
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Old 05-13-2011, 12:32 PM   post #22 of 25
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Default Re: Knocking Engine... 351W

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Originally Posted by Ingersoll444 View Post
Thats probably not a bad fix. easy engine, and may just need a head gasket.
IF he's lucky!--I have seen a few Fords with bad head gaskets burn a channel in the block where the flame traveled between cylinders due to the bad gasket...many engines that had coolant get into the crank case dont run for long after the head gasket is replaced too,the coolant eats the bearing babbit..had more than one engine start rapping a week or two after replacing the gasket..

I sold a lot of Ford oil pumps and the hex drive shaft that drives it--they often got chunks of valve stem seals sucked into the pump gears and the driveshaft would twist up like macaroni!...I've known a few guys who just replaced main & rod bearings and the oil pump after an oil starvation failure occoured and they got lucky,it ran great again and didn't spin any bearings..one guy had his oil filter fall off on the highway and he ran it over!--then drove it 5 miles home,and he just put new bearings and oil pump in it--I told him not to waste his time or money,but the darn truck ran for 2 years afterwards till he decided to sell it,just to make me look like an a$$!..

Sometimes its just as cheap and easier to just put a good used salvage yard engine in a vehicle when the engine "might" not pan out if repaired...my friend who runs a garage wont do engine work ,he prefers just replacing the engine the first time ,and I cant blame him...
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Old 04-08-2012, 12:49 PM   post #23 of 25
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Default Re: Knocking Engine... 351W

My rebuilt 8n engine has a knock after 100 hrs.....could anything be adjusted a bit to lessen it ??? Is there any timing adjustment in the distributor??
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Old 04-08-2012, 12:52 PM   post #24 of 25
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Default Re: Knocking Engine... 351W

Its in dublin georgia...anyone know any good 8n mechanics in that area?? Im at 561-512-1765 cllr
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Old 04-08-2012, 12:53 PM   post #25 of 25
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Default Re: Knocking Engine... 351W

Im in palm beach florida
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