Looking for a cruise control servo for my 1973 olds 98,,,I can depress mine and hold my finger over the tube and it does not keep the diaphram in,,The repair manual states it need to be replaced...So I am looking for one...Can these be resealed or is a replacement needed..

 

Assuming the bellow is not cracked or otherwise damaged. I repaired the one on my 70 by taking the two end plates out of the bellow and cleaned them up real nice. I then used blue silicone sealer in the bellow on both ends where it seals against the plates. I used two large hose clamps to hold it in place until the silicone dried. Has been in place for over a year and works fine.

 

I will check to see if I have an extra vacuum diaphragm. PM sent.

 

Jeff has a good repair procedure for sure.
The servos come apart pretty easy. Do that if the rubber is not cracked.
Good servos are hard to find nowdays as they are not reproduced.
Even if you fix yours, it may be a good idea to be on the lookout for another in case the rubber cracks on yours.

 

hey Jeff,,,Mine seems different from what u desribe..I took mine apart and it consisted of a rubber boot,,,a spring,,,A flat disk...

 

would i seal the rubber boot around the metal end piece

 

The 70 servo is different than the 73 servo but the sealing technique is the same.
First check the rubber by compressing it and looking for deep cracks. If rubber is ok, just take it apart and clean it up real good. Clean up and sand the metal edge where the rubber sets in. Clean away any rust and debris from the rubber's slot that the metal edge goes in. Reassemble and see if it still leaks.
If it still leaks, then use some weatherstrip adhesive or RTC sealant in the groove of the rubber.
If it still leaks then there is prolly a small crack or tear in the rubber that was overlooked. That ~might~ be able to be repaired with weatherstrip cement or maybe even a bicycle tube patch!
Here is how I did restored mine.
https://classicoldsmobile.com/forums...html#post62613
Continue reading til the end - i think it should help you.

 

ok, i took it apart and cleaned it very well and cleaned out the grove in the rubeer piece..I put it back together and it is holding 100% better....I can hear a small leak,,,I am sure it is comming from the rubber not sealing all around the diameter of it..The rubber is in good shape and not cracked...Should i go ahead and run a bead around the grove to seal it..

 

Mine was slightly stretched from age and did not fit tight around the metal plates. I used the 2 large hose clamps to gently clamp the rubber around the plates to hold it while the sealer dried. This ensures a nice tight fit and a better chance of it sealing. Sounds like with some sealer you should be good to go.

On another note there seem to be some possible options for replacements for the 70 style bellow. OPGI lists one that looks to be the same for the 68-72 Pontiac GTO.

http://www.opgi.com/product.asp?Prod...CatCatalog=GTO

Also the mid 80's Jaguar XJ6 used a similar cruise set up and I have seen them listed on evil bay and other suppliers.

I came across these while researching the fix for mine. I have not seen them personally and cannot say they are exact. The thought of ordering one to see and to have a replacement is on my list.

 

i sealed mine up,,i wish i would of thougHt about the hose clamps,,,I just checked it and it seems to be holding,,,

 

Glad you got it fixed, regardless. A tiny tiny leak will not affect performance of the servo. I think yours will be fine.

Now that the early version of the bellows are being reproed, hopefully the later ones will be reproed next. The one linked above at OPG will not work for post 71 Olds.

 

Glad to hear that you got your's fixed. I only had one. Sorry.

 

No problem thanks for checking

 

Hi Rob,
I see that you say that the OPG 67-72 GTO repo unit wont work to replace a post 1971 Servo. I have a 72 Olds 442 with cruise and was hoping that repo unit might be a fit...Al