truck was at the dealer for an engine knocking noise that they said was normal but they also said there is alot of valve noise and they need to be ajusted is this normal ? and should this be warranty work thanks for the in put

Put some information on what you drive so we can have a idea what kind of truck you are talking about...

Just guessing by your screen name that you have a D-max. I called two dealers when I first got my 02 S-max to see what the recommended valve adjustment intervals were or if there was one. The answer I got was that there is no recommended valve adjustment intervals, they are hydraulic self adjusting. They said that short of having mechanical work done that affected them there was no reason to mess with them. So if this is true, then my question would be what has happened or what is not working that has caused them to need to be adjusted. That is the word I got from the dealership. My 02 is also fairly loud especially when the engine is loaded. It to sounds like a tapping, but like you I have also heard this is fairly common.

The valves are not hydraulic. They are adjustable and do not need to be adjusted on a normal bassis, but should be adjusted if the valve cover is ever removed in my opinion.Especially if doing injectors.Lash is .012.If it really bothers you it should be waranty but will fall under $100 deductible after 3/36.

The valves are not hydraulic. They are adjustable and do not need to be adjusted on a normal bassis, but should be adjusted if the valve cover is ever removed in my opinion.Especially if doing injectors.Lash is .012.If it really bothers you it should be waranty but will fall under $100 deductible after 3/36.


exactly, this is not something done on a normal basis. the 7.3 powerstrokes for example are hydraulically actuated. if the need arises, you cant adjust them, you have to buy a rebuild kit more or less for the valvetrain(*possibly valves, pushrods, rocker arm assembly, etc.)

So these engines have Solid lifters in them?

Is it a roller cam?

Yes on the roller cam.

You may be surprised at how much a proper valve adjustment quiets the engine.

You may be surprised at how much a proper valve adjustment quiets the engine.

And what would this surprise cost a person bringing it into your shop?

my dealer told me 9-12 hrs at 110 an hour

OOOUUUCCCCHHHHH! thats going to leave a mark

yea im going to get it looked at somewhere else they told me that it is regular maintenance and should be done between 24,000 & 35,000mi

did that come with a tube of anal-ease!

And I thought my dealer was HIGH priced on labor at $75.00 an hour!

Does anyone know how to adjust the valves??? Or should I ask if anyone wants to share their knowledge???

It's not too bad once you get the upper cover off.You have to put the motor @ tdc and adjust a series of valves, rotate 1 revolution and adjust another series of valves.It does make quite a difference in noise.
12 hours is excessive when injectors only pays 8 and it's alot more work.

Valve adjustment is easy. there are enough good people on this site that could help.

I emailed a tech at one of the dealerships here in town asking for a little explanation about the valves since I was told once before that they were hydraulic self adjusting. I don't like giving out bad info. Here is the response I got. Clear as mud I guess. I am one of those types that needs to see it or at least be able to viualize it, reading about it doesn't usually do to much for me.

The valve system on your engine is oil fed hydraulic lash adjusters.
They are pumped up to the right amount of lash, automatically. The lifter
need only be adjusted, if taken apart and then set to a base point, so that the lash adjusters can work properly.

I wouldnt go to him for a valve adjustment, obviously he was not in class the day we discussed dmax valve trains.


His response even confused me....

taken straight from gm

"The engine utilizes a mechanical roller lifter for valve operation. The shaft mounted rocker arms have roller tips for reduced friction and wear. One rocker arm operates two valves simultaneously through a valve bridge."

there is no recommended adjustment interval but there are bulletins for ticking / knocking and it says to check for sticking valves or misadjustment.

It's not too bad once you get the upper cover off.You have to put the motor @ tdc and adjust a series of valves, rotate 1 revolution and adjust another series of valves.It does make quite a difference in noise.
12 hours is excessive when injectors only pays 8 and it's alot more work.

the 8 hours is warranty pay, valve adjustment is customer pay. There is a difference.

if you give a fax # ill fax you the gm procedure

Valve Lash Adjustment


http://service.gm.com/engif/000/000/667/667477.gif
http://service.gm.com/tif.gif (http://service.gm.com/servlets/RetrieveTif?pic=667477)
Rotate the crankshaft to bring the number 1 cylinder at the top dead center of the compression stroke. The number 1 cylinder is the front cylinder on the right bank. The mark on the crankshaft balancer should be aligned with the mark on the engine.
http://service.gm.com/engif/000/000/663/663897.gif
http://service.gm.com/tif.gif (http://service.gm.com/servlets/RetrieveTif?pic=663897)
Loosen the valve adjusting screws.
Insert a feeler gauge between the tip of the rocker arm and the valve bridge.
http://service.gm.com/engif/000/000/663/663110.gif
http://service.gm.com/tif.gif (http://service.gm.com/servlets/RetrieveTif?pic=663110)
Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Adjust the valve lash to 0.3 mm (0.012 in). Refer to Valve Clearance Adjustment Specifications (http://service.gm.com/servlets/CellHandler?CellId=64270&RefDoc=667264&evc=sm) to determine which valves that can be adjusted when the engine is at Top Dead Center.
Tighten
Tighten the valve lash lock nut to 22 N·m (16 lb ft).

http://service.gm.com/engif/000/000/667/667477.gif
http://service.gm.com/tif.gif (http://service.gm.com/servlets/RetrieveTif?pic=667477)
Rotate the crankshaft one revolution to bring the number 1 cylinder at Top Dead Center of the exhaust stroke.
http://service.gm.com/engif/000/000/660/660548.gif
http://service.gm.com/tif.gif (http://service.gm.com/servlets/RetrieveTif?pic=660548)
Adjust the valve lash to 0.3 mm (0.012 in). Refer to Valve Clearance Adjustment Specifications (http://service.gm.com/servlets/CellHandler?CellId=64270&RefDoc=667264&evc=sm) to determine which valves that can be adjusted when the engine is at Top Dead Center.
Tighten
Tighten the valve lash lock nut to 22 N·m (16 lb ft).