TL engine type question

Old May 20, 2006 | 08:28 AM
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TL engine type question

Does anyone know if the engine in my 2002 TL-p is a free-running or interference engine ?
Thanks
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Old May 20, 2006 | 09:01 AM
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Interference.
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Old May 21, 2006 | 10:34 AM
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ok i know in an interference engine the valves lock in place but why? when the free running doesnt. what makes each either lock or not...sorry for the newbie question
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Old May 22, 2006 | 07:43 AM
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Interference means that the valves and the piston both occupy the same space - but not at the same time.

If you break a timing belt in an interference engine while driving there is a good chance that one or more of the valves will stop in their opened position. This means that the next time the piston goes to TDC it will slam into the valve and cause major engine damage.

In a non-interference engine, the valves never open to a point where the piston could hit them. You can break a timing belt in one of these engines without fear of engine damage.

The valves will always stop before the crank when a timing belt breaks due to the larger rotational mass of the crank & torque converter (or direct connection to the drive train via clutch in a manual).
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Old May 22, 2006 | 09:28 AM
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From: Appleton WI
Originally Posted by fla-tls
Interference means that the valves and the piston both occupy the same space - but not at the same time.

If you break a timing belt in an interference engine while driving there is a good chance that one or more of the valves will stop in their opened position. This means that the next time the piston goes to TDC it will slam into the valve and cause major engine damage.

In a non-interference engine, the valves never open to a point where the piston could hit them. You can break a timing belt in one of these engines without fear of engine damage.

The valves will always stop before the crank when a timing belt breaks due to the larger rotational mass of the crank & torque converter (or direct connection to the drive train via clutch in a manual).
Well put
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Old May 23, 2006 | 02:19 PM
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2003 type S got chain or belt??
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Old May 23, 2006 | 02:26 PM
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Originally Posted by boczo777
2003 type S got chain or belt??
belt
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Old May 23, 2006 | 02:27 PM
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They're ALL belts.
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Old May 23, 2006 | 02:30 PM
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so when the belt should be replaced??
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Old May 23, 2006 | 02:30 PM
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Originally Posted by TLMugen
They're ALL belts.
Belts arent bad. they are quiet, and light weight. And mine lasted 200k and liik like it could go atleast another 100k+
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Old May 24, 2006 | 07:34 AM
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Originally Posted by fla-tls
Interference means that the valves and the piston both occupy the same space - but not at the same time.

If you break a timing belt in an interference engine while driving there is a good chance that one or more of the valves will stop in their opened position. This means that the next time the piston goes to TDC it will slam into the valve and cause major engine damage.

In a non-interference engine, the valves never open to a point where the piston could hit them. You can break a timing belt in one of these engines without fear of engine damage.

The valves will always stop before the crank when a timing belt breaks due to the larger rotational mass of the crank & torque converter (or direct connection to the drive train via clutch in a manual).
A'ight thanks
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Old May 24, 2006 | 08:58 AM
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Originally Posted by fsttyms1
Belts arent bad. they are quiet, and light weight. And mine lasted 200k and liik like it could go atleast another 100k+
I had TBs snap on two of my DSM cars . Although both a warranty and recall covered the repairs, they were out of commission for a while (read: Interference).

Fortunately, this will not be a problem with my Maxima.
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Old May 24, 2006 | 09:18 AM
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Originally Posted by fsttyms1
Belts arent bad. they are quiet, and light weight. And mine lasted 200k and liik like it could go atleast another 100k+
You have been running on the same timing belt for 200k miles?!! That's impressive. But don't tell your mechanic that, he'll have a heart attack.
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Old May 24, 2006 | 03:50 PM
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From: Appleton WI
Originally Posted by F23A4
I had TBs snap on two of my DSM cars .
Well the fact that they were DSM was teh problem

And ive also replaced snapped chains more often then belts. the fact is both can go. (especially on turbo/manual motors)

Originally Posted by Nakamichi
You have been running on the same timing belt for 200k miles?!! That's impressive. But don't tell your mechanic that, he'll have a heart attack.
I am the machanic. And i have told others. My belt at 200k looks like new yet. No dry rot, no cracking no nothing. I would have easily trusted it to go another 100k+
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Old May 25, 2006 | 08:44 AM
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Originally Posted by fsttyms1
Well the fact that they were DSM was teh problem

And ive also replaced snapped chains more often then belts. the fact is both can go. (especially on turbo/manual motors)
I find it a bit unlikely that the chain on my 02 Maxima (currently 45k) would snap at the same 25k and 58k that the belts in my Eagle Summit DOHC and Plymouth Colt GT (respectively) snapped.
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Old May 25, 2006 | 09:40 AM
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From: Appleton WI
Originally Posted by F23A4
I find it a bit unlikely that the chain on my 02 Maxima (currently 45k) would snap at the same 25k and 58k that the belts in my Eagle Summit DOHC and Plymouth Colt GT (respectively) snapped.
like i said the belts snapped because they where Chrystler products

Its highly unlikely that a chain would stretch and snap that early but i have seen it. (hell my friend has a maxima that had one go with about 60k on it. All i have ever said is its possible for bot to go, If they were that bad Honda the worlds best engine builder wouldnt use them. Ive had honda motors with damn near 300k on the originals. (and ive also seen them go early on) every thing is possible
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Old May 25, 2006 | 07:59 PM
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Originally Posted by fsttyms1
Belts arent bad. they are quiet, and light weight. And mine lasted 200k and liik like it could go atleast another 100k+
Timing chains on newer cars aren't loud.
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Old May 25, 2006 | 09:15 PM
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From: Appleton WI
Originally Posted by MattB
Timing chains on newer cars aren't loud.
I dont mean loud as in muffler no muffler loud. There is a noise and smoothness difference in belt vs chain. Especially on SOHC and DOHC engines. and they are heavier and take more to turn them (minimal power loss but there)
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