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      08-27-2008, 09:00 AM   #1
jkp1187
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Question Timing Belt

Is there a timing belt in either the N52 or N54 engines? If so, what is the recommended service interval? Thanks.
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      08-27-2008, 09:24 AM   #2
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Chains.
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      08-27-2008, 10:37 AM   #3
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Internal?
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      08-27-2008, 10:43 AM   #4
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Timing chain supposed to last for a very long time and does not required periodic replacement or service until it start slipping.
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      08-27-2008, 11:15 AM   #5
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The chains are encased.
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      08-27-2008, 11:18 AM   #6
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Quote:
Originally Posted by My135 View Post
Timing chain supposed to last for a very long time and does not required periodic replacement or service until it start slipping.
A slipping time chain will likely destroy the engine because you are going to bend valves...unless you are itching for a new engine, replace the chain and chain guides before then :wink:

...I replace the timing chain at the 100,000 mile mark...
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      08-27-2008, 11:20 AM   #7
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If a timing chain ever slips, you've got some serious problems.
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      08-27-2008, 11:38 AM   #8
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How could a chain slip? I imagine it's something like a bicycle chain, right? A bicycle chain has to be pretty worn before it slips, nothing like the notched belt in many cars.
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      08-27-2008, 11:52 AM   #9
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Quote:
Originally Posted by gio View Post
How could a chain slip? I imagine it's something like a bicycle chain, right? A bicycle chain has to be pretty worn before it slips, nothing like the notched belt in many cars.
Over time, the chain will stretch, when that happens, the teeth will begin to wear, and before you know it, the stretched chain will slip over worn teeth...ka boom
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      08-27-2008, 12:50 PM   #10
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The owners manual that came with the car doesn't say anything about regular maintenance on the chain. What are we supposed to do?
My TTs manual said to change the timing belt every 115,000 miles I think.
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      08-27-2008, 01:31 PM   #11
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To continue the bicycle analogy, with a bike you measure the chain and when it starts to show wear, by increased length, you change it to keep it from wearing down the teeth in the front chainring and rear gear cluster.
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      08-27-2008, 06:12 PM   #12
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I think there is a chain tensioner which is spring loaded to keep tension on the chain. Years ago I rebuilt and tuned MG engines and that is how MG did it.

It’s the timing belts that need to be replaced at 100K miles, chains last forever. Also, if you do not have a zero clearance engine and the timing chain slips the engine should not be harmed. If you have a zero clearance engine and the timing belt/chain slips the pistons hit the valves and ruin the engine.
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      08-28-2008, 11:36 AM   #13
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Quote:
Originally Posted by IDBMW View Post
Also, if you do not have a zero clearance engine and the timing chain slips the engine should not be harmed. If you have a zero clearance engine and the timing belt/chain slips the pistons hit the valves and ruin the engine.
So does anyone know if either of these engines are "zero clearance engines"?
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      08-28-2008, 11:44 AM   #14
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Quote:
Originally Posted by Nixon View Post
So does anyone know if either of these engines are "zero clearance engines"?
isn't everything zero clearance now?
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      08-28-2008, 03:13 PM   #15
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Quote:
Originally Posted by Mad Dragon View Post
If a timing chain ever slips, you've got some serious problems.
+1 lol
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      08-29-2008, 09:16 PM   #16
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Quote:
Originally Posted by Nixon View Post
So does anyone know if either of these engines are "zero clearance engines"?
Yes, they are both zero clearance. Many past BMW owners have found this out by the dreaded "mis-shift" downshift that over-rev'ed the engine, floats the valves, and said valves impact the piston tops. Nasty (and very expensive) business.
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