Engine Still Tapping After Cam Change...
#1
Engine Still Tapping After Cam Change...
So, i changed the Camshaft in my car after it started tapping and causing a light miss-fire.
Got it all back together last night and after running the cam in it still taps and settles to a slight mis-fire.
The Cam i removed was dead, over 2-3mm missing off some lobes.
I havn't had the rocker cover back off yet, but im thinking a dropped valve maybe?
Got it all back together last night and after running the cam in it still taps and settles to a slight mis-fire.
The Cam i removed was dead, over 2-3mm missing off some lobes.
I havn't had the rocker cover back off yet, but im thinking a dropped valve maybe?
#4
PassionFord Post Troll
Which cam did you go for in the end? (not that it really changes anything)
Whats your oil pressure? hot/cold
And i take it you ran it in properly?
Whats your oil pressure? hot/cold
And i take it you ran it in properly?
#5
Havn't tested oil pressure... I dont have a gauge!
Tried it with a new pattern cam and and good used cam from my collection. Both do the same.
It taps all the way through the 20minute run in and still taps now.
I'll pull the cam out tonight, inspect the head and check theres oil getting up there! Maybe run it without the rocker cover...
Tried it with a new pattern cam and and good used cam from my collection. Both do the same.
It taps all the way through the 20minute run in and still taps now.
I'll pull the cam out tonight, inspect the head and check theres oil getting up there! Maybe run it without the rocker cover...
#6
Another thing to note is that, ive recently changed to fuchs 10w50 oil, was using castrol 10w40 before. When i dropped the oil out after replacing the cam there was afew bits of "mayo" in it, leading me to think the head gasket has failed... But the cooling system doesnt lose pressure!
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#8
PassionFord Post Troll
Hope you fitted new lifters with the new cam. If not you've wasted your time anyway. Using a second hand cam was a waste of time IMO (with cvhs its just pointless).
Cant believe you haven't got an oil pressure gauge tho
Cant believe you haven't got an oil pressure gauge tho
#10
PassionFord Post Troll
When you say labelled up do you mean tappets in order too? If so thats fair enough.
Did you check over the rockers when you had it stripped. Ive had 2 (on seperate occassions) crack underneath that looked fine in situ, but when i removed them i spotted very fine cracks which under lift were expanding and causing a racket and essentially flex in the valvetrain.
Not alot else that can tick or cause misfires other than a burnt out valve tbh (compression test will soon show that one)
Did you check over the rockers when you had it stripped. Ive had 2 (on seperate occassions) crack underneath that looked fine in situ, but when i removed them i spotted very fine cracks which under lift were expanding and causing a racket and essentially flex in the valvetrain.
Not alot else that can tick or cause misfires other than a burnt out valve tbh (compression test will soon show that one)
#13
PassionFord Post Whore!!
iTrader: (3)
It generally will tap all the way through the running in phase while its bedding in and the tappets fill with oil
Have you changed the oil after running it in? I hope so as all the swalf and metal filings will be running around your engine
When ever I have fitted a cam it's taken an oil change and a 20min run to get it to settle in
Check rockers are tightened correctly aswell
Have you changed the oil after running it in? I hope so as all the swalf and metal filings will be running around your engine
When ever I have fitted a cam it's taken an oil change and a 20min run to get it to settle in
Check rockers are tightened correctly aswell
#17
So..
Cranked it over with rocker cover off n plugs out, lifters get soaked in oil within 2-3seconds and soon after the head has loads of oil round it.
Compression Tested her to, 138, 140, 140, 142. All 140psi near as makes no difference.
Checked the bores with a scope and nothing obvious... Some droplets in cylinder 1 around the head gasket, but not alot, could be excess fuel?
Maybe mis-fire could be a faulty coilpack and the tapping could be a lazy lifter or cracked rocker? Basically 2 seperate faults?
Cranked it over with rocker cover off n plugs out, lifters get soaked in oil within 2-3seconds and soon after the head has loads of oil round it.
Compression Tested her to, 138, 140, 140, 142. All 140psi near as makes no difference.
Checked the bores with a scope and nothing obvious... Some droplets in cylinder 1 around the head gasket, but not alot, could be excess fuel?
Maybe mis-fire could be a faulty coilpack and the tapping could be a lazy lifter or cracked rocker? Basically 2 seperate faults?
#19
Advanced PassionFord User
tapping sounds like a lifter knackered tbh.surprised u haven't got an oil pressure gauge dude.my orion runs 80psi+ when cold and will stay around 60psi when at cruise
#21
Got it all back together this morning and its fine now, good as gold...
When i removed a plug todo comp test last night it wasnt very tight, im wondering if that caused the tapping in the same way a blown exhaust manifold gasket does. Looking at it this morning it didnt have a compression washer on it. Would also answer to the misfire...
Plugs went in before the cam change was even thought of, and i didnt do much mileage on them before a tapping developed, plug working loose?
The mis-fire was still apparent on start up, but cleared with a quick blip of the throttle, lifter pumping up to take up the play in the worn cam?
So new cam solves the mis-fire...
But new plugs cause another one along with a tapping noise.
When i removed a plug todo comp test last night it wasnt very tight, im wondering if that caused the tapping in the same way a blown exhaust manifold gasket does. Looking at it this morning it didnt have a compression washer on it. Would also answer to the misfire...
Plugs went in before the cam change was even thought of, and i didnt do much mileage on them before a tapping developed, plug working loose?
The mis-fire was still apparent on start up, but cleared with a quick blip of the throttle, lifter pumping up to take up the play in the worn cam?
So new cam solves the mis-fire...
But new plugs cause another one along with a tapping noise.
#22
PassionFord Post Troll
Hmm just keep an eye on it. If its sorted happy days, but we all know these engines like to fix themselves then break again several times per week
#26
PassionFord Post Whore!!
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