Vacuum Issues
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Vacuum Issues
Hey y'all. Looks like I'm the new guy with a bunch of dumb new guy questions. Anyway, I have a 79 Bronco with a 400 and I know there are a ton of vacuum issues from the booster to the HVAC system changing between heat and defrost depending on rpm, etc. So my question is, does somebody have a diagram or could tell me how many or where all the vacuum lines are on this thing? I would really appreciate it.
Next question, I need a crank case filter for my passenger side valve cover. I assume it's supposed to be a push in style filter, but can somebody tell me diameter the VC hole will accept?
Last but not least, what all could cause a cylinder miss? Busted rings, out of time, bad plugs and wires...are there any more?Thanks for any answers.
Next question, I need a crank case filter for my passenger side valve cover. I assume it's supposed to be a push in style filter, but can somebody tell me diameter the VC hole will accept?
Last but not least, what all could cause a cylinder miss? Busted rings, out of time, bad plugs and wires...are there any more?Thanks for any answers.
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I'll try giving this one last bump. I know my questions are probably extremely newbish and underneath alot of yall's expertise (because I highly doubt I stumped the biggest ford truck based website out there), but we all need to start somewhere. So thanks for any help.
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Joined: Dec 2008
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From: Southern Oregon Coast
Do you have a service manual of some sort? Even a Chilton's or a Haynes is better than nothing and they usually have diagrams in them.
If you go into Autozone or Checker (or whomever) and tell them what you have, they should give you the correct size breather cap. Try this:
AutoZone.com | Vehicle Selection | Year
On the cylinder that's missing, have you done a compression test? You may have a sunk exhaust valve - I've had 2 of those with that problem on my 400...
If you go into Autozone or Checker (or whomever) and tell them what you have, they should give you the correct size breather cap. Try this:
AutoZone.com | Vehicle Selection | Year
On the cylinder that's missing, have you done a compression test? You may have a sunk exhaust valve - I've had 2 of those with that problem on my 400...
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Thanks yall. I do have a Hayne's manual, so then that should definitely help. As for the compression test, I read somewhere the 400 should be somewhere 150psi and each cylinder should be within 10% of eachother, right? My question to that though, if the readings come back bad, that means bad rings/damaged piston/valve issue.
Anyway, thanks for the info. I came from a family that wasn't very mechanically inclined, but I always loved the old steel...and if you're gonna have them you're gonna have to know how to fix them,...and I'm learning.
Anyway, thanks for the info. I came from a family that wasn't very mechanically inclined, but I always loved the old steel...and if you're gonna have them you're gonna have to know how to fix them,...and I'm learning.
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From: Saskatchewan
You should buy a compression tester - I use this type - you will need someone to crank the engine for you. Test compression then squirt oil into the chamber and test again - if compression goes up that cylinder has worn rings - otherwise a valve condition is suspected.
55-1313, Engine Compression Tester Cal-Van tools, new on eBay.ca (item 120359147106 end time 30-Mar-10 23:43:24 EDT)
*****
As for vac leaks I first remove the air cleaner and look across the manifold for broken vacuum caps that need replacing. The aps are best bought in a NAPA type store in small packs with various sizes.
25 Rubber Vacuum Caps Black For 1/8" Diameter on eBay.ca (item 400086838167 end time 21-Mar-10 05:49:31 EDT)
Another accessible place is both ends of the vacuum driven brake booster for cracks in the hose.
Use the manual by looking in the INDEX to get to the right section(s) quickly
55-1313, Engine Compression Tester Cal-Van tools, new on eBay.ca (item 120359147106 end time 30-Mar-10 23:43:24 EDT)
*****
As for vac leaks I first remove the air cleaner and look across the manifold for broken vacuum caps that need replacing. The aps are best bought in a NAPA type store in small packs with various sizes.
25 Rubber Vacuum Caps Black For 1/8" Diameter on eBay.ca (item 400086838167 end time 21-Mar-10 05:49:31 EDT)
Another accessible place is both ends of the vacuum driven brake booster for cracks in the hose.
Use the manual by looking in the INDEX to get to the right section(s) quickly
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Thanks again yall, great info.
I do have one more question, and I think it may be over my head, but does anyone have or know where a good write-up would be for replacing ball joints on the D44 in my Bronco?
I do have one more question, and I think it may be over my head, but does anyone have or know where a good write-up would be for replacing ball joints on the D44 in my Bronco?
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From: Southern Oregon Coast
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One last question...Does anyone know where I can get a replacement Vacuum Switch valve? I looked through a Dennis Carpenter catalog and didn't see one and I also check Bronco Graveyard and didn't see one. Thanks for any help.
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From: Saskatchewan
I do not know if this is the component. You might have to re-enter the site or change the vehicle to be sure. (I used a 1975 ford pickup)
http://shop.premiumcarparts.com/buy....e=standard&s=1
I bookmark a lot of these places since I never recall the store names..
http://shop.premiumcarparts.com/buy....e=standard&s=1
I bookmark a lot of these places since I never recall the store names..