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david craig
david craig, Auto Mechanic
Category: Mercedes
Satisfied Customers: 2775
Experience:  owner/mechanic at 3D Automotive
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O2 ml320 front engine tap only sounds like it's on the

Customer Question

O2 ml320 front engine tap only sounds like it's on the drivers side
Submitted: 9 months ago.
Category: Mercedes
Customer: replied 9 months ago.
I was thinking lifters but I pulled the valve cover on drivers side snd don't have any that I can move by hand?
Expert:  david craig replied 9 months ago.

Hi Im David...you were on the right track because common noises for this engine are the valve lifters that make a tapping rattling type noise.

If the engine has low oil pressure, this could be causing the noise in the lifters

Make sure to change the oil filter and all 4 o-rings on the oil filter housing since a clogged oil filter or leaking o-rings can cause the low oil pressure condition.

Customer: replied 9 months ago.
Did that and it only sounds like 1 lifter not multiple
Customer: replied 9 months ago.
Catalytic converters were just changed also
Customer: replied 9 months ago.
If it was a lifter would u be able to move it by hand a little in the right cam position?
Expert:  david craig replied 9 months ago.

you are talking about rockers. the lifters can only be checked by removong them and checking for it being clogged with sludge or dirt. some times a faulty lifter will allow for rocker arm movement but not always. and it is always recommended to replace all the lifters, not just one.

Customer: replied 9 months ago.
As noisy as it is I would of thought u would be able to feel the clearance somewhere
Customer: replied 9 months ago.
What else can make a noise like that
Expert:  david craig replied 9 months ago.

if it at the front of the engine it could be timing component noise.

Expert:  david craig replied 9 months ago.

has the oil light come on or flickered lately?

Expert:  david craig replied 9 months ago.

when was your latest oil change?

Customer: replied 9 months ago.
No nothing like that
Expert:  david craig replied 9 months ago.

I have to think its the lifter issue. other than that, a timing chain tensioner/chain slapping, and a long time ago there was a recall out about the harmonic balancer making tapping and other noises along with vibration

Customer: replied 9 months ago.
Yah it really sound's up high on drivers side,I even tried flushing the motor a couple times to free up whatever debris might have gotten stuck in the lifter
Customer: replied 9 months ago.
How do the lifters come off the rockers if I have to go that route
Expert:  david craig replied 9 months ago.

sorry for the delay. was getting late last night. thank you for your patience. i will get you that information.

Expert:  david craig replied 9 months ago.

1

Remove cylinder head covers (6)

2

Position crankshaft to 0 degrees after ignition TDC of cylinder 1

NOTE: Engine must not be rotated backwards.

3

Remove chain tensioner (5)

4

Take off camshaft bearing bridges (7 and 8)

NOTE: Installation: Inspect basic position of camshafts, if necessary.

5

Use a 2 mm drift to press compensation element (11) of the relevant cylinder out of the roller rocker arms (9)

CAUTION: Do not use a magnet!

-

The slide surface of the compensation element (11) would get magnetized. This can cause minute iron chips to accumulate, which in turn can
damage the compensation element (11) and the cam.

NOTE: Installation: The disk in the roller-type rocker arm at the top must face downwards with slots towards the compensation element (11)!
Compensation elements which have not been replaced, must be re-installed at the same point.

6

Install in the reverse order

Expert:  david craig replied 9 months ago.

tensioner removel for timing chain

1

Remove viscous fan (1)

NOTE: Right-hand thread!

2

Remove fan shroud (2).

NOTE: On model 163 unscrew bolts at bottom of fan shroud. Model 463

3

Remove poly V-belt (3)

NOTE: Installation: Lock tensioning device with a drift or pin (diameter 5 mm).

4

Remove generator (4)

5

Take chain tensioner (6) off timing case cover (5)

NOTE: Installation: Replace sealing ring (7).

6

Install in the reverse order.

Customer: replied 9 months ago.
Why would you mess with the timing chain tensioner when u can unbolt the rocker arm assembly off the top of camshaft?
Expert:  david craig replied 9 months ago.

you will need to unbolt all of the rockers, and move that loosens the cam. the tensioner will need removed to allow the cam to lift or move out of the way.

Expert:  david craig replied 9 months ago.

which means the cam journals will need to be removed. you cannot do that safely with tension on the cam sprockets

Customer: replied 9 months ago.
All I need to get off are the rockers right they just unbolt off the topside of the cam the cam should stay in place?
Expert:  david craig replied 9 months ago.

The valve covers will have to be removed and then the rocker arm bridges removed. Only then can you pull the lifters out of the rocker arms to replace them. Parts should be around $300 for all lifters and labor is around 5.0 hours.

Expert:  david craig replied 9 months ago.

checking in to see how its going...

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