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  #1  
Old 01-27-2011, 04:39 PM
bad91ranger bad91ranger is offline
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Default engine noise!

mY 91 Ranger 4.0 is making a noise from the engine...almost sounds like a knocking but my oil pressure is good and still runs very strong...could this be the lifters possibly or maybe a rod knocking? Like i said oil press is good and still has very good power to it....any clues?
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  #2  
Old 01-27-2011, 05:26 PM
FordDude1991 FordDude1991 is offline
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Default Re: engine noise!

hard to diagnose, my 91 probe had a rod knock but oil pressure was great...

try to get a sound clip somehow
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  #3  
Old 01-27-2011, 05:27 PM
bad91ranger bad91ranger is offline
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Default Re: engine noise!

oh and it also goes away then does it again....it is intermitent.
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  #4  
Old 01-27-2011, 07:13 PM
ranger4.0 ranger4.0 is offline
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Default Re: engine noise!

Is it like a ticking? I got a 93' and the timing chain is getting pretty old so it could be slapping agianst the plastic guards. Mine really only does it when its cold because the 4.0l and 3.0l colonge engines have poor oil flow to the lifters and other upper engine parts so when its cold it ticks really loud. You can try to change the timing chain but in the rangers you have to pull the engine. Best of luck to you! Keep me posted!
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  #5  
Old 01-27-2011, 07:30 PM
dirttrackracer dirttrackracer is offline
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Default Re: engine noise!

i know a soulution!!!!!!! turn your radio up haha, i can barley hear my truck and its straight pipe underneath the cab


valves tapping? mine did that last year adjusted the valves and its gone. im not sure if its your problem but worth a check.
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  #6  
Old 01-28-2011, 04:48 AM
bad91ranger bad91ranger is offline
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Default Re: engine noise!

Actually it does do it when it's cold and as it warms up it goes away. Guess it is just the poor oil flow I've heard about..I will keep an eye on it and keep u guys posted. Thanks for the help guys!!!!
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  #7  
Old 01-28-2011, 05:18 AM
naturecakezzz naturecakezzz is offline
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Default Re: engine noise!

My ohv has been ticking since 100k it now has 130k .. I was told it's because of the design of the engine.it doesn't get good circulation to the valves
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  #8  
Old 07-06-2011, 06:59 PM
Decline87 Decline87 is offline
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Default Re: engine noise!

The answer your looking for is this: the older (ohv) 4.0 had one faulty design which resulted in the hydraulic roller lifters not getting enough oil supply. This caused the lifters to wear prematurely, also that creates a gap which is the "noise" your hearing. I've been through this problem before and the only real solution is to swap the engine with a 98' or newer (sohc) 4.0 engine. These ones used a camshaft driven timing chain to each cylinder head and didnt rely on pushrods, lifters or rocker arms. Plus it would be a step up from 160hp to 207hp.
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