BrickBoard Archives
The files contained in this listing have been automatically archived from the active forums. Because the vast majority of posts are now in one place, this archive is considered legacy. You should use the SEARCH feature OR choose your topic and select date tabs within the forum you choose.
AC belt and pulley, '89 240DL[850/1995] posted by Bruce Jea on
Friday, 27 March 1998, at 3:45 p.m.
The AC belt lost quite a few chunk of teeth while driving and the belt
jammed the pulleys, I mean, the pulley in front of the crank is jammmed
stationary while idling with consequent loss of the functions of AC and
PS and the belt is still in one piece. The car has separate AC and PS belts.
While checking belt, I noticed some oil leaking from the bottom of the
timing cover, which didnt exist before this happened. And when the belt
went, a few loud bang was heard under the hood and I was using the AC.
The engine still runs good. No other damage was seen.
The AC belt lost quite a few chunk of teeth while driving and the belt
jammed the pulleys, I mean, the pulley in front of the crank is jammmed
stationary while idling with consequent loss of the functions of AC and
PS and the belt is still in one piece. The car has separate AC and PS belts.
While checking belt, I noticed some oil leaking from the bottom of the
timing cover, which didnt exist before this happened. And when the belt
went, a few loud bang was heard under the hood and I was using the AC.
The engine still runs good. No other damage was seen.
Questions:
Does the the accessory pulley (that drive the AC andd PS) in front of the
crank has some fail-safe design built in so when the belt jams, the crank
is not affected. I am asking this because the same pulley on my '78, B21F,
is bolted to the crank by couple of bolts, so there is no way the pulley can
remain stationary while the engine is running unless the bolts are all sheared.
I doesnt seem to be the case on the '89. So does the pulley need to be
replaced?
Could the crank seal be damaged in the manner?
Are there any trick I should know to put the belt on? The tension
adjustment mechanism seems to have 2 parallel radius arms. On each arm
there is also a treaded rod which is attached to the arm by a strange bolt
and a regular hex nut. So do I ajust it by turnig the rod or by first loose
the bolt and nut?
Bruce
'78 , B21F
'89, B230F-K, 240DL
Re: AC belt and pulley, '89 240DL[850/1995] posted by Don Willson on
Friday, 27 March 1998, at 8:18 p.m.
I presume when you refer to the accessory pulley you are referring to the big heavy one at the bottom of the engine, that is driven from the crank. If so this is the harmonic balancer and helps smooth out the pulsations of the engine.
It is truly made in 3 pieces, the hub which is attached to the crank, a rubber ring, then the outer pulley section. Yes this can slip. Paint a stripe from across the rubber section then try to turn the outer section or run the engine if you can. If it is slipping you will notice the painted line from the hub to the pulley is no longer continuous. When this is slipping it often sounds like a slipping belt.