Question about Chevrolet 1500

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Valve lifters leak down or could it be a worn lobe on the camshaft Does this engine have cam shaft problems?

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  • donjeanlasle Sep 15, 2010

    what about the camshaft, is this a common problem?

  • donjeanlasle Sep 15, 2010

    somewhat helpful



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Check for a collasped lifter or bent push rod,or a broken valve spring.I do not know what year or engine this is ,all I know is that it is a gm model of some sort,some of the 2.8 engines had a bad problem of lifters loosing a prime,if the lifter is collasped,then the lifter has to be replaced to solve the problem.

Posted on Sep 15, 2010

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Sep 15, 2010

    Like I said,I dont know what year or make or model ,so I do not know if it is a common problem.Look at the travel on the rocker arm to see if it goes down all the way,and up ll the way compared to the other rocker arms.


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When you say leak down I assume you mean you pressurized the cylinder and the pressure was lost, if this is correct there are several possibilities. I am not aware of any cam shaft problems on Chevy engines. Failing a leak down test could be bad valve Seats, Worn Valves, Worn Lobes, Valves out of adjustment. Have a Valve Job done to repair this. If you did a compression check and the compression was off do a Valve job and while you have the head off give yourself some piece of mind and replace the timing chain/belt and the Piston Rings.

Posted on Sep 15, 2010


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Have a ticking noise coming from inside engine,mechanic thinks its probably a worn canshaft 170000kms

the noise is most likely from worn hydraulic lifters rather than cam shaft
the key is your statement that the noise is worse when starting up
Cam shaft noise will be constant with rpms but lifter noise will decrease as the oil pressure builds up
At the klms you state , it is time for a hydraulic lifters set to be removed and have a leak down test done as they will be showing signs of wear
Find an accredited service shop that specializes in your make of car , have the noise properly diagnosed and get a quote for repairs

Mar 02, 2016 | Cars & Trucks

2 Answers

Does this car take a valve lash adjustment and what are the settings

Your car has hydraulic lifters. Hydraulic lifters just means that it uses engine oil to control the valve clearances using a bucket and shim arrangement.
Here's a generic image of what a hydraulic lifter can look like:25949035-hsh3lir2aljnaf1jzrgt1uh1-5-0.jpg

If the car makes a tapping sound at start up, this points to a problem in the camshaft area - including the hydraulic lifers/shims. Valve clearances are controlled by the lifters and shims. It could also be a worn camshaft - the lobes can become rounded.

Usually, there is no adjustment possible with most hydraulic lifters. Replacement (usually) means you have to remove the camshaft, though I am by no means certain about your particular model.

If you have the tools and ability, remove the rocker cover and have a look at things.

25949035-hsh3lir2aljnaf1jzrgt1uh1-5-1.jpg The image above shows a camshaft - the lobe is worn and rounded. When this happens valve clearance is excessive and may lead to a tapping noise. Engine efficiency is also affected.

The image below shows hydraulic lifters (example only..).
The lifter on the left has a 'dished' surface - wear caused by the camshaft or the lifter not being able to 'turn' in its bore.
25949035-hsh3lir2aljnaf1jzrgt1uh1-5-3.jpg The usual cause of this is (a) short trips where the engine hasn't had a chance to warm up properly and pump oil to the camshaft area (b) poor oil/infrequent oil changes (c) stuck lifter.

Before you spend money on parts or repairs, first try adding some oil flush to the engine to clear out carbon and 'sticky' deposits.

... follow the instructions on the bottle...
Then change your engine oil and add something like a 'valve train additive' - this will try and quieten the tapping noise.
The (Ebay) link below will give you an idea of what additives are available (and so will your local car accessory shop).

Try the cheapest and easiest first. If that doesn't work .. unless you are confident that you can inspect, diagnose and replace parts .. give a mobile mechanic a call. Those guys are usually quite good.

12results for camshaft additive

Nov 08, 2015 | 2004 Suzuki Forenza

2 Answers

What cause tick tick noise in my cylinder head,funny part when I drive& apply clutch the noise disapear.(Ford bantam 1.8diesel endura de) do I need to change oil or bent valves? Pls help

A ticking noise in the cylinder head area is usually associated with the camshaft/followers, which may be worn.
Here's a couple if images: cause-tick-tick-noise-in-cylinder-drn4r4jcf5cpqfgonvky3zim-5-0.jpg The lobe of the camshaft wears - becomes 'rounded'

cause-tick-tick-noise-in-cylinder-drn4r4jcf5cpqfgonvky3zim-5-1.jpg The cam follower - what the camshaft pushes against to open and close the valves - can become worn.. 'dished' at the top.

It is unlikely you will have to change any valves, unless of course there is wear/damage.

The reason why the tick noise disappears when you are driving is because oil is getting pumped up to the camshaft area, between the cam lobe and the follower and acting as a 'cushion'.

A vehicle that has hydraulic lifters.. they control valve clearances by using oil. Like conventional cam followers, they can wear.

Changing your oil won't cure any wear. You could try using a valve train additive to try and quieten things down.


Hydraulic lifter:

Nov 06, 2015 | Cars & Trucks

1 Answer

I have a 2000 polaris sportsman335 and the camshaft lobe is flat seems the part has been discontinued any ideas on how to fix or where to get the part thanks

the camshaft lobe is part of the cam shaft so if it is worn down then you need a new cam shaft
I would check with the service agent as I seriously doubt that cam shafts would be discontinued items
the same cam probably fits a range of engines

Sep 06, 2015 | Cars & Trucks

1 Answer

Exhaust cam problem #3 cylinder

as the exhaust cams are fixed on the camshaft, unless there is a failure of the cam lobe for no 3 cylinder , there will be problems for all the cylinders on that cam
have a compression test done to check for burnt /bent valve or a loose valve seat insert for that cylinder
of the valves are operated by a rocker off the cam, it may be a rocker bush or worn rocker shaft that is the problem and not the cam shaft.

Sep 05, 2015 | 2004 GMC Envoy

1 Answer

Daewoo dtech 1600 motor 180000km

most new cars have hydrolic lifters when the are worn they start ticking at first but gradualy get louder then end up like a penny in a can rattley not sure on model but if you can get at lifters you can check if they are worn by pushing on the if the drop thats the one thats gone but also the lobe on the cam can be worn as well this makes them tap as well hope this helps ivan

Oct 22, 2012 | Cars & Trucks

1 Answer

X25xe noisey lifter

Sounds like a bad lifter or a bad lobe on a camshaft. Not real familiar with the brand, sometimes you need to pull off the valve cover if it is a pushrod design and check with fingers on rocker arms while engine runs.

But if this is an overhead cam you would need to pull the camshaft and look at cam lobes. Then look for flattened lifter face. Some overhead cams can have lifter discs to adjust gap between lifter and camshaft. Some of the old VW engines used this system. It worked pretty well, but you needed discs on hand to make precise changes.

Apr 07, 2012 | Vauxhall Vectra Cars & Trucks

1 Answer

Have a Hyundai Tuson. Worn out cam shaft gear after 107000klms. Rockers worn, cross heads worn. Cam shaft marked a lobe. Can these cams be ground or will you have lifter problems.

if all these parts have wear marks then all the components will have to be replaced with can have the cam reground but its probably cheaper and quicker to replace with new by the time you find a place to weld regrind the lobes and get the part back and hope it won`t give you a problem,so you don`t have to tear down again.

May 21, 2011 | 2009 Hyundai Tucson

1 Answer

Rapping noice, sounds like a hard is it to fix without going to garage

do to the complexity of the 4.2 dohc engine i am pretty sure you will find that you have a worn lobe on the cam shaft you will need to remove the intake and exhaust manifolds and remove the cam gears supporting the cam chain make sure the engine is on number on compression before removeing it once the manifolds are removed you can remove the valve cover to inspect the cam lobes and valve height

Jan 08, 2010 | 2002 Chevrolet TrailBlazer

1 Answer

Hyraulic lifter worn

If it wore down due to lack of lube then there is a very good chance that the cam is worn as well.

Sep 11, 2009 | 1966 Ford Mustang

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