Timing chain rattle?
01-08-2007, 11:21 PM
#11
5th Gear Member
Join Date: Mar 2006
Location: arizona
Posts: 3,893
RE: Timing chain rattle?
and in case anyone is curious why there are 3, ill go into that too.
the 4.0 SOHC was originally a 4.0 OHV (pushrod) motor. So the middle shaft (now called balance shaft) was once the camshaft. so there has to be a chain that runs from the crank to the balance shaft (old camshaft place) so from there it is cheaper to just make chains running from the balance shaft to each camshaft. Otherwise they would have a problem with the angle of the chain coming from the crankshaft to the camshafts, making for either massive redesign, or adding more complicated tensioners, etc.
the 4.0 SOHC was originally a 4.0 OHV (pushrod) motor. So the middle shaft (now called balance shaft) was once the camshaft. so there has to be a chain that runs from the crank to the balance shaft (old camshaft place) so from there it is cheaper to just make chains running from the balance shaft to each camshaft. Otherwise they would have a problem with the angle of the chain coming from the crankshaft to the camshafts, making for either massive redesign, or adding more complicated tensioners, etc.
01-09-2007, 12:20 AM
#12
RE: Timing chain rattle?
ORIGINAL: fazm
and in case anyone is curious why there are 3, ill go into that too.
the 4.0 SOHC was originally a 4.0 OHV (pushrod) motor. So the middle shaft (now called balance shaft) was once the camshaft. so there has to be a chain that runs from the crank to the balance shaft (old camshaft place) so from there it is cheaper to just make chains running from the balance shaft to each camshaft. Otherwise they would have a problem with the angle of the chain coming from the crankshaft to the camshafts, making for either massive redesign, or adding more complicated tensioners, etc.
and in case anyone is curious why there are 3, ill go into that too.
the 4.0 SOHC was originally a 4.0 OHV (pushrod) motor. So the middle shaft (now called balance shaft) was once the camshaft. so there has to be a chain that runs from the crank to the balance shaft (old camshaft place) so from there it is cheaper to just make chains running from the balance shaft to each camshaft. Otherwise they would have a problem with the angle of the chain coming from the crankshaft to the camshafts, making for either massive redesign, or adding more complicated tensioners, etc.
01-09-2007, 07:14 PM
#15
4th Gear Member
Join Date: Feb 2006
Location:
Posts: 1,794
RE: Timing chain rattle?
unfortunatly there are more moving parts, but the way i see it, this design allows it to be stronger. instead of 2 long chains that have further distances to travel and more pressure per distance, we have 3 smaller chains with less load per distance..
break a twig, once its soo small its harder to break
break a twig, once its soo small its harder to break
11-22-2012, 07:04 PM
#16
2nd Gear Member
Join Date: Sep 2008
Location: MICHIGAN
Posts: 374
Thought I would raise this thread from the dead.
In the last week my Mustang has started exhibiting the classic symptoms of a loose timing chain tensioner. The car runs great, but rattles for a half second at startup, and then rattles between 2400 and 2700 rpm. I haven't read much about this problem in Mustangs, but the Explorer guys are all over it.
My car has 153,000 miles on it.
In the last week my Mustang has started exhibiting the classic symptoms of a loose timing chain tensioner. The car runs great, but rattles for a half second at startup, and then rattles between 2400 and 2700 rpm. I haven't read much about this problem in Mustangs, but the Explorer guys are all over it.
My car has 153,000 miles on it.
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