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Old 06-14-2006, 11:46 AM   #21
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It'* a good thing I ditched my DOHC Sebring. I never really liked that engine, though it'* better than the 2.7 from what I understand
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Old 06-14-2006, 12:07 PM   #22
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are 3800s non interference?

I don't we don't really have to worry about it cause they're pushrod motors...still curious though.
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Old 06-14-2006, 12:09 PM   #23
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3800'* are non- interference.
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Old 06-14-2006, 12:11 PM   #24
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Quote:
Originally Posted by bonnie94ssei
It'* a good thing I ditched my DOHC Sebring. I never really liked that engine, though it'* better than the 2.7 from what I understand
Oh god! The 2.7 sludge monster! My aunt had a nasty expierience from that engine. She hadn't changed her oil, and we did it and it was near the consistency of goo. She was so lucky it didn't kill the POS 2.7.
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Old 06-14-2006, 12:15 PM   #25
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Quote:
Originally Posted by VigCS
are 3800s non interference?

I don't we don't really have to worry about it cause they're pushrod motors...still curious though.
Can you explain why it being a pushrod motor has anything to do with the possible interference when a timing chain snapped (if it were to happen)?
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Old 06-14-2006, 12:18 PM   #26
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Quote:
Originally Posted by bonnie94ssei
It'* a good thing I ditched my DOHC Sebring. I never really liked that engine, though it'* better than the 2.7 from what I understand
Yes the 2.7 was a POS... I can't begin to tell you how many of those totally dies before 100K...And what the yards around here want for one is nuts( They are in high demand BTW )... The 2.7'* are all junk even if you doo keep the oil changed like a nut...

The 4 cylinder laster a hell of a lot longer and was better by far...

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Old 06-14-2006, 12:29 PM   #27
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Quote:
Originally Posted by VigCS
are 3800s non interference?

I don't we don't really have to worry about it cause they're pushrod motors...still curious though.
This is a neat one to explain...

If we look at the old 3.0 Buick V6, really a shorter stroke 3.8( yes shorter deck heigth too ).... It was not supposed to be an interference engine.... But with the 3.0 having 9.0 - 1 compression pistons, the dish was very shallow and didn't leave much room for the valves.... What usually happened with these motors if that the Nylon Teeth would strip off the Cam gear and the result is that the engine would jump time... I have seen a couple of 3.0'* that were running down the interstate when this happened, and all of the valves left marks on the pistons, crushed a couple of valves and bent a series of pushrods...

The 3.8 and 3800 had 8.5 - 1 compression for many years... I have seen the 3.8'* jump time as they used the same nylon teeth on the cam gear for a while, I have never seen a 3.8 get damaged.. They would just jump a tooth and have hard starts, bad idle, and then finally when it jumped further it just quit...

With the 3800 GM tried to correct for these problems... An all steel cam gear with a timming chain tensioner... I have almost never heard of a 3800 jumping time, but its still possible...

On the L36 we have 9.4 - 1 compression, and the pistons are damn near flat... I would be willing to bet that if one of these L36'* jumped time we'd know about it in a hurry... But when was the last time you heard of an L36 doing this? I have seen LN3'* all original with 300K+ on them all original.... So weather or not we'll see one jump time will only be seen in the future

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Old 06-14-2006, 12:36 PM   #28
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Right...the chances of us seeing it are lower than very slim. Like a 350, you'd wear a hole in the cover before you could jump a tooth.
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Old 06-14-2006, 12:48 PM   #29
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The car has 76k on it and this is the first time the belt is being changed.

Bill thank you for that article.
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Old 06-14-2006, 12:52 PM   #30
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Quote:
Originally Posted by Bonneville94V688
Quote:
Originally Posted by bonnie94ssei
It'* a good thing I ditched my DOHC Sebring. I never really liked that engine, though it'* better than the 2.7 from what I understand
Oh god! The 2.7 sludge monster! My aunt had a nasty expierience from that engine. She hadn't changed her oil, and we did it and it was near the consistency of goo. She was so lucky it didn't kill the POS 2.7.
Yes the 2.7 sludge monster. Just looking at that engine gives me a headache. It looks like a mess.

My Sebring is at 43K and would have been due for a timing belt change within a year the rate I drive. I'm glad I really don't have to worry about bending valves if my chain should go.

Which brings up a question...what'* the interval of changing the timing chain on our engines? How much over 100K in other words? If a water pump should go I guess it would be a good time to change it too.
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