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Timing belt actuator


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#21 Galaxie500XL

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Posted 06 March 2017 - 01:08 PM

You might also look around the EGR mounting to the manifold...my first timing belt replacement, I had problems getting the EGR to seal properly on the manifold.


galaxie500xl

1988 Camaro IROC-Z 5.7 TPI 5-speed

2011 Chevrolet Equinox LT

1994 LeBaron GTC Convertible

GONE to a new home... 1995 Cutlass DOHC Convertible, 3rd Quarter 2012 W-Body.com COTQ

1993 Buick Century station wagon...sold to our son, kept in the family since 2003


#22 Schurkey

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Posted 06 March 2017 - 08:23 PM

Didn't know rockauto doesn't have the hydraulic tensioner.

The tensioner is not hydraulic.  It works on a screw-thread principle; spring-loaded.  There is oil inside for lube, but it isn't pressurized.

 

I suppose the spring could break (hey, anything can happen) but I wouldn't expect that to be a common problem, as the spring is only tightened at timing-belt installation time, and then gradually unwinds as the belt wears.  So you own the car 300,000 miles, you've changed the timing belt five or six times--the spring has been tensioned and unwound six or seven times.  Meanwhile, the valve springs have been tensioned and relieved about eleventy-billion times.


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#23 dogginred90

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Posted 07 March 2017 - 01:26 AM

Didn't get a chance to look at it tonight. It was getting dark and I wanted to get the mufflers off to get ready for new ones. The one was original, I can't believe it lasted that long. This car is a Pa. car all its life and no rust at all. Original 90,000 mile car. Hopefully I can look at it more during the week.

#24 White93z34

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Posted 07 March 2017 - 02:18 PM

The tensioner is not hydraulic.  It works on a screw-thread principle; spring-loaded.  There is oil inside for lube, but it isn't pressurized.

 

I suppose the spring could break (hey, anything can happen) but I wouldn't expect that to be a common problem, as the spring is only tightened at timing-belt installation time, and then gradually unwinds as the belt wears.  So you own the car 300,000 miles, you've changed the timing belt five or six times--the spring has been tensioned and unwound six or seven times.  Meanwhile, the valve springs have been tensioned and relieved about eleventy-billion times.

 

When I had a belt let go on my old 93' Z34 it was the tensioner that failed, spring inside broke, the belt, and all other components for that matter were just fine. I've seen that failure mode enough to deduce that its at very least not unheard of.

 

I used to buy them from the dealer, but it seems that's getting to be a hard to find part these days.


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-Chris D.

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1992 Chevrolet Lumina Z34 3.4L TDC v6 Getrag 284
1990 Pontiac Turbo Grand Prix 3.1L v6 Hydramatic 4T60 Qty:2
2001 Cadillac Seville STS 4.6L DOHC v8 Hydramatic 4T80
1987 Chevrolet Camaro Z28/IROC-Z 5.0L v8, Hydramatic 700R4


#25 Galaxie500XL

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Posted 07 March 2017 - 05:04 PM

The last one I bought cost around $140.00 from the dealer, and it took several days to get one in.

 

My last one failed the same way, after only around 30,000 miles...and it was brand-new.


galaxie500xl

1988 Camaro IROC-Z 5.7 TPI 5-speed

2011 Chevrolet Equinox LT

1994 LeBaron GTC Convertible

GONE to a new home... 1995 Cutlass DOHC Convertible, 3rd Quarter 2012 W-Body.com COTQ

1993 Buick Century station wagon...sold to our son, kept in the family since 2003


#26 dogginred90

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Posted 19 March 2017 - 09:11 PM

Well I got the Z34 inspected today. Finally able to drive it. My son just took it out with his mom for the first time. Guy that inspected it asked if I bought it down South. I told him no, and then asked why. He never seen a car that old with no rust, especially here in lovely Pennsylvania lol.
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#27 jiggity76

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Posted 20 March 2017 - 12:10 AM

Awesome, another on the road again.  Glad to hear it's running and I hope everyone (especially your boy) is enjoying it!



#28 dogginred90

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Posted 20 March 2017 - 12:32 AM

He was super excited. He only has his permit right now. He wants his mom to sleep in the back while he is in school, so he can show it off all day at school lol

#29 MemphisMan

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Posted Today, 09:09 PM

I found the actuator on group1autoparts.com.  I'd never used that site before, but didn't have a problem.  I ordered it Thursday and it came today.  The price was $76.53 with $8.56 shipping.  It's a genuine GM part made in Japan.  I also ordered the gates timing belt kit from amazon for $118, so I'll be changing all 3 pulleys, actuator, and belt.  Lot's of discussion on whether to change this out or not.  I'm going to, and of course keep the original just in case they become unavailable.  

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