Timing chain

[NORBI]

I have a question about timing chains on 2.8 engines. When chain brakes do pistons bend walves or is it like the 3.4 DOHC nothing happens?

[Robby1870]

Yes, if the timing chain breaks, you will have interference meaning bent valves

[NORBI]

How often should you change chains on cars because i know about the belt is about 70k

[99RegalGS]

How often should you change chains on cars because i know about the belt is about 70k

A mechanic once told me that after 100k the timing should be replaced. Not because of the chances of it breaking but for timing chain stretch.

 

When I replaced my timing chain at 120,000 miles it had quite a bit of slack. The new chain had as much slack w/o the tentioner as the old one had with it.

[NORBI]

does anybody know if Aurora 4.0 has a chain or belt same for 1998 Chrysler Concorde with 2.7?????//

this made me little scared and will change it before they break

[99RegalGS]

I don't know about the Chrysler but the Aurora has a chain. The Aurora might be a non-interference engine, so the valves won't bend if the chain breaks.

 

I wouldn't worry alot about timing chains, It's not that common that they actually break. I know of a few cars that have over 200,000 miles on the original chain.

[Guest TurboSedan]

mine has 213,xxx miles now and it's fine, but i suppose i'll get a new timing chain set when i add all of my extra TGP parts

joshua

[paulo57509]

I wouldn't worry alot about timing chains, It's not that common that they actually break. I know of a few cars that have over 200,000 miles on the original chain.

 

I have to agree that chains typically don't break.

 

What usually lets go is the cam sproket. Especially if the engine has one of those "silent" plastic/aluminum cam sprokets. The teeth get stripped right off.

 

Chains do stretch however. Add this to a silent sprocket and you have a recipe for failure.

[luminator94]

How about the Series II 3800's? Are they non-interference?

 

 

Aaron

[99RegalGS]

I think all OHV engines are interference engines.

[Dan94Z34]

all OHV motors are interfearing engines. Iv'e only heard of one chain breaking, and that was a 350,and he reved it to over 7grand.

[GRANDFURY]

how hard is it too change a timing chain?

[99RegalGS]

There wern't any hard steps when I changed mine.

 

I think it took me 4 hours from start to finish.

[jfrazee10]

my 88 cavaliers timing chains guide broke and cause my chain to stretch. i ourchased a new chain and guide and my camshaft and crankshaft timing marks will not line up..what does this mean?

[Schurkey]

New chain, old sprockets??? Not recommended.

 

The sprockets must align. Apparently you don't have the engine far enough apart yet. Must remove pushrods so cam can turn without pushing the valves into the pistons. If you've already tried to force the cam to turn...you may now have bent valves.

 

Once you can turn the camshaft, align the cam and crank gears, install chain and guides.

 

"I" would then degree the camshaft; but most folks don't. It's easy for the camshaft to be up to ten degrees away from where it should be in relation to the crankshaft; two-to-four degrees is moderately common. You won't know FOR SURE unless you check. Less than two degree error is probably not important for a grocery-getter.