Exsessive Clearance on rocker arm
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From: Sandy
Exsessive Clearance on rocker arm
Does anyone know how I could potentially go about repairing my valve train noise, I been dealing with it for a little bit now and the way it would go was it would have the tick on start up but then after a while of idling (10 - 15 minutes) it would go away, one day I was doing valve cover gasket and noticed I had one valve that had a 10 thousandths clearance (measured with feeler gauges) between the valve and the rocker arm, I have tried some oil additives like seafoam and when I did a oil change, it went away so much where it was unexpected for it not to be there, but now it's randomly back I tried looking it up but I'm wondering if I can get away with doing rocker shafts and arms or if I have to do lifters
Its most likely the Lifters that are the issue
Good news is its just annoying doesn't hurt anything
Bad news is you have have to pull off the heads to change the Lifters
You can pull the push rods and compare length and tip wear with just valve covers off, but long shot for that being the problem
4.0l OHV oils lifters and rockers from the 2 inner Cam Bearing passages, so as the Cam bearings wear down the oil pressure at the lifters and rockers goes down, this was also an issue on the earlier 2.9l engines but happened with lower miles, so less so on the 4.0l OHV, but as the miles go up................well same symptom
Lifters are hydraulic so use oil pressure, but they also have a spring inside to hold them tight when engine is off, and at start up, common for these springs to wear out or even break
I would image the one lifter in your engine with excessive clearance has a bad spring, could be more than one
And lifters have several small oil passages that can clogged up, so cold thicker oil doesn't flow easily thru them, but once oil is warmed up and thinner it does, so they quiet down
Oil treatments can for sure quiet noisy valve trains, several ways, coating metal parts so "softer" noise, and cleaning out smaller oil passages, from cam bearings and in the lifters
Good news is its just annoying doesn't hurt anything
Bad news is you have have to pull off the heads to change the Lifters
You can pull the push rods and compare length and tip wear with just valve covers off, but long shot for that being the problem
4.0l OHV oils lifters and rockers from the 2 inner Cam Bearing passages, so as the Cam bearings wear down the oil pressure at the lifters and rockers goes down, this was also an issue on the earlier 2.9l engines but happened with lower miles, so less so on the 4.0l OHV, but as the miles go up................well same symptom
Lifters are hydraulic so use oil pressure, but they also have a spring inside to hold them tight when engine is off, and at start up, common for these springs to wear out or even break
I would image the one lifter in your engine with excessive clearance has a bad spring, could be more than one
And lifters have several small oil passages that can clogged up, so cold thicker oil doesn't flow easily thru them, but once oil is warmed up and thinner it does, so they quiet down
Oil treatments can for sure quiet noisy valve trains, several ways, coating metal parts so "softer" noise, and cleaning out smaller oil passages, from cam bearings and in the lifters
Last edited by RonD; Feb 20, 2024 at 12:53 PM.
Thread Starter
|
Member
Joined: Feb 2024
Posts: 4
Likes: 0
From: Sandy
Its most likely the Lifters that are the issue
Good news is its just annoying doesn't hurt anything
Bad news is you have have to pull off the heads to change the Lifters
You can pull the push rods and compare length and tip wear with just valve covers off, but long shot for that being the problem
4.0l OHV oils lifters and rockers from the 2 inner Cam Bearing passages, so as the Cam bearings wear down the oil pressure at the lifters and rockers goes down, this was also an issue on the earlier 2.9l engines but happened with lower miles, so less so on the 4.0l OHV, but as the miles go up................well same symptom
Lifters are hydraulic so use oil pressure, but they also have a spring inside to hold them tight when engine is off, and at start up, common for these springs to wear out or even break
I would image the one lifter in your engine with excessive clearance has a bad spring, could be more than one
And lifters have several small oil passages that can clogged up, so cold thicker oil doesn't flow easily thru them, but once oil is warmed up and thinner it does, so they quiet down
Oil treatments can for sure quiet noisy valve trains, several ways, coating metal parts so "softer" noise, and cleaning out smaller oil passages, from cam bearings and in the lifters
Good news is its just annoying doesn't hurt anything
Bad news is you have have to pull off the heads to change the Lifters
You can pull the push rods and compare length and tip wear with just valve covers off, but long shot for that being the problem
4.0l OHV oils lifters and rockers from the 2 inner Cam Bearing passages, so as the Cam bearings wear down the oil pressure at the lifters and rockers goes down, this was also an issue on the earlier 2.9l engines but happened with lower miles, so less so on the 4.0l OHV, but as the miles go up................well same symptom
Lifters are hydraulic so use oil pressure, but they also have a spring inside to hold them tight when engine is off, and at start up, common for these springs to wear out or even break
I would image the one lifter in your engine with excessive clearance has a bad spring, could be more than one
And lifters have several small oil passages that can clogged up, so cold thicker oil doesn't flow easily thru them, but once oil is warmed up and thinner it does, so they quiet down
Oil treatments can for sure quiet noisy valve trains, several ways, coating metal parts so "softer" noise, and cleaning out smaller oil passages, from cam bearings and in the lifters
Ah I see, so its gonna be a long job, thank you for the information
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