Vacuum Wipers
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Junior User
Joined: Dec 2014
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Vacuum Wipers
Hi Guys,
I have no experience with vacuum wipers.... so maybe this is something small.
I have a 51 Mercury M3 and it has vacuum wipers. Motor is a SBC 305 TPI if it matters.
When I tested the wiper motor with a small piece of hose right off the plenum, it worked. Now withe everything buttoned up, I have a "T" to the MAP sensor and to the wiper motor.
The wiper motor won't work now. Ideas???
Thanks John
I have no experience with vacuum wipers.... so maybe this is something small.
I have a 51 Mercury M3 and it has vacuum wipers. Motor is a SBC 305 TPI if it matters.
When I tested the wiper motor with a small piece of hose right off the plenum, it worked. Now withe everything buttoned up, I have a "T" to the MAP sensor and to the wiper motor.
The wiper motor won't work now. Ideas???
Thanks John
Lead Driver
Joined: Jul 2011
Posts: 6,599
Likes: 34
From: Rockingham, VA
Hi Guys,
I have no experience with vacuum wipers.... so maybe this is something small.
I have a 51 Mercury M3 and it has vacuum wipers. Motor is a SBC 305 TPI if it matters.
When I tested the wiper motor with a small piece of hose right off the plenum, it worked. Now withe everything buttoned up, I have a "T" to the MAP sensor and to the wiper motor.
The wiper motor won't work now. Ideas???
Thanks John
I have no experience with vacuum wipers.... so maybe this is something small.
I have a 51 Mercury M3 and it has vacuum wipers. Motor is a SBC 305 TPI if it matters.
When I tested the wiper motor with a small piece of hose right off the plenum, it worked. Now withe everything buttoned up, I have a "T" to the MAP sensor and to the wiper motor.
The wiper motor won't work now. Ideas???
Thanks John
Thread Starter
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Junior User
Joined: Dec 2014
Posts: 68
Likes: 0
There is vacuum there if I pull the hose off the motor. Not sure how much should be there though... no gauge.
No sure where else to tap. The plenum has 3 ports and I'm using them for: MAP, brake booster, and Fuel pressure Reg.
No sure where else to tap. The plenum has 3 ports and I'm using them for: MAP, brake booster, and Fuel pressure Reg.
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Junior User
Joined: Dec 2014
Posts: 68
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I have a build thread in here somewhere
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FTE Legend
Joined: Oct 2005
Posts: 283,380
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From: northwestern Ontario
That looks cool, I'll have to look for your build thread. You should put it in your signature.
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Hotshot
Joined: Feb 2015
Posts: 17,559
Likes: 1,081
From: Central Delaware
Try a bit of lube on the vacuum unit and arms. Also, check the hose for cracks or other leaks. Last, spray some water on the windshield before trying the wipers. I've owned a few vehicles with vacs and none of them liked dry windshields.
You might want to consider a vac can.
You might want to consider a vac can.
Hotshot
Joined: Oct 2004
Posts: 15,882
Likes: 88
From: Durham NC
Vacuum motors on wipers are really simple buggers. Don't be afraid to disassemble it, clean it and relube all (few that there are) moving parts with a good light bodied grease like white lithium. It will usually have it working better than new.
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