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'88 MBZ 560SL cycling thru lifters/rocker arms
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drsxwyf
New User
Feb 20, 2008, 12:02 AM
Post #1 of 9
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'88 MBZ 560SL cycling thru lifters/rocker arms
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Hi,
I have an '88 Mercedes 560SL with 135K miles on it. At 120K miles it got a valve job. About 10K miles later one of my "lifters" started ticking, a noise not present prior to the valve job. My mechanic replaced the noisy lifter (which starts out very quiet then becomes increasingly louder) at no charge, apologizing that the machine shop he used must not have done a good job....? About 700 miles later another lifter started to tick, then another, then another. My mechanic has now replaced 4 of my lifters, one aprox. every 700 miles; it goes in next week to get a 5th lifter replaced. When I joked "...four more and we're done..." he replied "...unless it starts to cycle all over again?"
What is going on with my poor car? Is there something my mechanic isn't telling me? And after doing a little research, it appears the part my mechanic has been replacing is a Rocker Arm; is that the same as a "lifter?"
(This post was edited by drsxwyf on Feb 20, 2008, 1:26 AM)
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Feb 20, 2008, 11:39 AM
Post #2 of 9
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Re: '88 MBZ 560SL cycling thru lifters/rocker arms
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That's a rocker arm to me. Could be they don't get enough oil! Is oil pressure dropping off when warmed up?
T
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Guest
Anonymous Poster
Feb 20, 2008, 11:54 AM
Post #3 of 9
(4141 views)
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Re: '88 MBZ 560SL cycling thru lifters/rocker arms
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As far as I can tell, everything else is fine which is what has my mechanic stumped. The valve job was to correct an oil burning problem that caused my car to blow smokey exhaust. Could something be off with the valve job that would cause the rockers to one at a time go out of alignment, so to speak, and hit whatever it is a rocker arm hits when out of whack?
And, is a rocker arm the same thing as a lifter?
Thanks for your input!
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Feb 20, 2008, 12:23 PM
Post #4 of 9
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Re: '88 MBZ 560SL cycling thru lifters/rocker arms
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I don't know that engine at all really just the way things are done. A lifter is the part that follows the camshaft which might be what that rocker arm looking thing does. I don't know how they are adjusted if at all for this but if it wears enough to tick something isn't right. The valve parts would generally have LESS "lash" to tick when expanded metals are bigger/longer than when cold. Colder oil delivers thicker oil and oil pressure is higher when thicker - usually. That's what I was thinking.
Was the smokey exhaust corrected with the valve job? Perhaps the engine has more lower end wear than I would like to expect from a Benzo with fairly low miles for its age??
Perhaps changing the viscosity of the oil some would help with this - not sure from here,
T
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Double J
Veteran
/ Moderator
Feb 20, 2008, 3:28 PM
Post #5 of 9
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Re: '88 MBZ 560SL cycling thru lifters/rocker arms
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Read this....
NOTE: Install rocker arms in the same position from which they were removed.
If rocker arms are mixed up or replaced, check basic position of hydraulic valve clearance compensating elements.
When installing new rocker arms also replace the corresponding camshaft.
CAUTION : With hydraulic valve clearance compensating elements use rocker arm with chamfer (arrow) only.
Rocker arms of engines 116 and 117 and the rocker arms of engine 110 may not be interchanged.
This vehicle is equipped with hydraulic valve compensating elements and do not require adjustment.
NOTE: Store compensating elements in upright position only and do not disassemble.
Reinstall rocker arms and compensating elements in the same Place from which they were removed.
In the event of complaints about noise, check compensating elements as follows:
Checking :
1 Place cam tip opposite rocker arm in upward position. 2 Push with handle of a hammer against rocker arm.
If the ball head pressure bolt drops too fast when compared with other pressure bolts, replace hydraulic valve clearance compensating element.
3 Try to move rocker arm manually. If there is play, check basic position of compensating elements.
Sorry about the big pics...its ok when i'm writing the post but gets HUGE when previewed or posted...
Hope this sheds some light on this....
Jim
(This post was edited by JIM N on Feb 20, 2008, 3:30 PM)
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drsxwyf
New User
Feb 21, 2008, 9:31 PM
Post #6 of 9
(4125 views)
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Re: '88 MBZ 560SL cycling thru lifters/rocker arms
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Thank you! That gives me a lot to ask my mechanic when I take the car in next week to have the 5th rocker replaced! And it helps me to understand how things work and what the problem might be. My fear is that the cam is being damaged by the rocker hitting it. If the rocker shows wear from contact and needs replacing, why wouldn't the cam?
The pic's didn't download however? Maybe you wouldn't mind emailing them to me at theartdepartment@earthlink.net so I could better understand my situation via the visual aid.
Thanks again. I'll let you know what my mechanic says after I hit him with a few somewhat informed questions!
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Feb 21, 2008, 11:42 PM
Post #7 of 9
(4123 views)
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Re: '88 MBZ 560SL cycling thru lifters/rocker arms
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Try the pics again. It showed once and they got shy and hid once - they're back now?? They are huge and may stress this site's limits or something - who knows?
They're worth it,
T
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Guest
Anonymous Poster
Feb 23, 2008, 9:43 AM
Post #8 of 9
(4119 views)
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Re: '88 MBZ 560SL cycling thru lifters/rocker arms
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Yes, my oil pressure is dropping when the car is warm! I was watching my gage yesterday and when I'm accelerating the gage is just below the top (3) but if I'm idling it slips down to 2 after warmed up.
Thanks so much for bringing my attention to that. Lot's to discuss with my mechanic next week. Thank you!!
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Feb 23, 2008, 9:54 AM
Post #9 of 9
(4117 views)
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Re: '88 MBZ 560SL cycling thru lifters/rocker arms
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I don't know what oil pressure #3 then #2 really means in real pressure for the car. Any engine will settle to a lower #psi when warm especially at idle but must remain in norms. The less it drops off the better indicator of how good the general condition of usually main bearings are,
T
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