Weak Cam Chain Tensioner Symptoms - BMW Luxury Touring Community
 
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post #1 of 5 Old Sep 10th, 2013, 9:39 pm Thread Starter
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Weak Cam Chain Tensioner Symptoms

So one of the dealer techs , after taking her for a short ride, told me that he felt that Carpathia's cam chain tensioner was weak and needed to be replaced. Said he could feel some mid-range bogging and that was a symptom. True, or was he trying to BS me a $700 job that looks like I can do myself......if necessary?

DW

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post #2 of 5 Old Sep 11th, 2013, 9:53 am
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Re: Weak Cam Chain Tensioner Symptoms

Never heard that a cam chain tensioner can cause mid-range "bogging". Typically a defective cam chain tensioner will manifest itself first in noisy startup an idling, and if the chain gets really loose it will also rattle during higher speed. I doubt you will feel it in the engine performance, unless the chain has already jumped a tooth.

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post #3 of 5 Old Sep 11th, 2013, 11:43 am
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Re: Weak Cam Chain Tensioner Symptoms

Sounds fishy to me. A bad tensioner will announce itself with chain noise, and even then I do not see how it would affect engine performance to a noticeable level.

The tensioner really cannot become "weak", as it is actuated by engine oil pressure. If your oil pressure light does not come on, then this is highly unlikely. There is a spring in it, but that only keeps the plunger extended against the movable chain guide when the engine is stopped. Once started, the oil pressure applies far more pressure than the spring.

Get another dealer's opinion!

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post #4 of 5 Old Sep 11th, 2013, 1:30 pm
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Thumbs up Re: Weak Cam Chain Tensioner Symptoms

Quote:
Originally Posted by dshealey
Sounds fishy to me. A bad tensioner will announce itself with chain noise, and even then I do not see how it would affect engine performance to a noticeable level.

The tensioner really cannot become "weak", as it is actuated by engine oil pressure. If your oil pressure light does not come on, then this is highly unlikely. There is a spring in it, but that only keeps the plunger extended against the movable chain guide when the engine is stopped. Once started, the oil pressure applies far more pressure than the spring.

Get another dealer's opinion!
What David said! Get another opinion. It sounds like your mechanic there doesn't know what he's talking about!

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post #5 of 5 Old Sep 11th, 2013, 2:42 pm Thread Starter
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Re: Weak Cam Chain Tensioner Symptoms

Yeah. I've been around enough engines to suspect when I'm being flim-flammed. And man, did the sirens ever go off after hearing THAT one. But, since I'm always willing to learn something new, just thought I'd ask. Thanks, as always.

DW

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