Re: Hello and trying to fix wipers.
Posted by HH56 On 2022/8/22 15:03:15
I don't know how much performance suffers at altitude but apparently it is a thing because the AMC and Mercury forums have similar questions. It seems odd they would suffer that much loss in performance when the emergency fuel pump vacuum booster you found is only specified capable of 10 inches and the AMC guy was having issues with 16 inches being available.
The Mercury guy solved his issue with an electric vacuum pump but his pump was a NOS 6v Trico pump made for the job. Doing a search I did see a couple of NOS Tricos for sale on ebay but the 12v models I saw were extremely expensive. There are a couple of 12v Dorman pumps at Amazon for less than $100 with what appears to be 1/4" hose connections. They appear to be designed for Air Conditioning vacuum control requirements and might work for wipers if the volume is adequate. I still suggest you verify specs to see if the pump you choose is rated for what could be continuous duty. There might be something published on the Dorman website if you are looking at those.
If you are having fit issues with leaking at the vacuum slider I wonder if it might be warped. You could remove and check with a straightedge. If it is slightly bowed maybe some gentle wet refinishing on fine grade sandpaper laying on a plate of glass would get things in order. Add a bit of shim stock under the retaining bar for a tighter fit to the motor.
The other option would be to go with an electric motor. There are several refubished 55-6 Chevy passenger car motors on ebay at the moment. One looked like it had a slot for the coordinator but vendor did not have a clear enough view to be sure. It was also the most expensive offering. Downside to the Chevy motor is it is rather bulky and heavy. Here is a photo showing a Chevy motor which has the coordinator bracket and a mounted coordinator. Note the cable activated slide bracket is not stock. It was cobbled together because the original was toast and not usable at the time. New Chevy repro slides are now available.
Attach file:
Chevy wiper motor.jpg (29.54 KB)
The Mercury guy solved his issue with an electric vacuum pump but his pump was a NOS 6v Trico pump made for the job. Doing a search I did see a couple of NOS Tricos for sale on ebay but the 12v models I saw were extremely expensive. There are a couple of 12v Dorman pumps at Amazon for less than $100 with what appears to be 1/4" hose connections. They appear to be designed for Air Conditioning vacuum control requirements and might work for wipers if the volume is adequate. I still suggest you verify specs to see if the pump you choose is rated for what could be continuous duty. There might be something published on the Dorman website if you are looking at those.
If you are having fit issues with leaking at the vacuum slider I wonder if it might be warped. You could remove and check with a straightedge. If it is slightly bowed maybe some gentle wet refinishing on fine grade sandpaper laying on a plate of glass would get things in order. Add a bit of shim stock under the retaining bar for a tighter fit to the motor.
The other option would be to go with an electric motor. There are several refubished 55-6 Chevy passenger car motors on ebay at the moment. One looked like it had a slot for the coordinator but vendor did not have a clear enough view to be sure. It was also the most expensive offering. Downside to the Chevy motor is it is rather bulky and heavy. Here is a photo showing a Chevy motor which has the coordinator bracket and a mounted coordinator. Note the cable activated slide bracket is not stock. It was cobbled together because the original was toast and not usable at the time. New Chevy repro slides are now available.
Attach file:
Chevy wiper motor.jpg (29.54 KB)This Post was from: https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?post_id=247299