Go Back   Ford Truck Enthusiasts Forums > Performance, Engines & Troubleshooting > Ford Inline Six, 200, 250, 4.9L / 300
Sign in using an external account
Register Forgot Password?


Welcome to Ford-Trucks Forums!
Welcome to Ford-Trucks.com.

You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the Ford-Trucks Forums community today!





 
Reply
 
LinkBack Thread Tools Search this Thread
  #1  
Old 01-10-2011, 02:57 PM
|WYG|SS's Avatar
|WYG|SS |WYG|SS is offline
Senior User
 
Join Date: Sep 2009
Posts: 379
|WYG|SS is starting off with a positive reputation.
86 4.9l oil pressure?

well found out today my 86 bronco i bought has a blown head gasket. added almost a gallon of coolant into the radiator and started it up and it was smoking bad.


but recently i seen that the oil pressure on the aftermarket guage was reading about 20psi. what should it be at? it mostly read 40psi when i would drive it. what should i check for when i replace the head gasket?
__________________
1993 F150 4.9l 5spd 4x4, 128,000 miles.
NEW!! 1986 Bronco 4.9l 4spd Granny 4x4
Reply With Quote
  #2  
Old 01-10-2011, 06:44 PM
351M's Avatar
351M 351M is offline
Posting Guru
 
Join Date: May 2004
Location: Prince George, B.C.
Posts: 2,161
351M is starting off with a positive reputation.
I would start by not even starting it until you know if the coolant is getting into the oil pan. 20 at idle and 40 while driving isn't bad but running it with coolant in the oil will just take the bearings out.
Reply With Quote
  #3  
Old 01-10-2011, 08:12 PM
|WYG|SS's Avatar
|WYG|SS |WYG|SS is offline
Senior User
 
Join Date: Sep 2009
Posts: 379
|WYG|SS is starting off with a positive reputation.
cracked head

well got the head off, took a look at the gasket it was fine, then i took a look inside the cylinder wall it was fine, then the head and it had about a 1.5in crack up to the valve. i havent really check the coolant when i bought the truck in november. well i got a spare head im going to pop of another engine and check out. probably just get everything checked out and make sure it is good before i throw it on. what is the engine supose to be at for sure on oil pressure?

i will be pulling the oil pan off to replace the gasket and i mise well do the pump if its bad.



im not to upset cause i bout the bronco for $450, it just needed a carb and havent had a problem since. and i have a spare 4.9l that i got for $40.

now the only thing im upset about is that the guy installed a after market water temp guage in place of the wire and so it is just a metal wire that heats up, everytime i have looked at the temp guage it was fine, but is is cold out so the cold air would have cooled it down
__________________
1993 F150 4.9l 5spd 4x4, 128,000 miles.
NEW!! 1986 Bronco 4.9l 4spd Granny 4x4
Reply With Quote
  #4  
Old 01-11-2011, 12:16 AM
351M's Avatar
351M 351M is offline
Posting Guru
 
Join Date: May 2004
Location: Prince George, B.C.
Posts: 2,161
351M is starting off with a positive reputation.
No, cold air wouldn't cool it down, that line is full of either or butane, something like that. As the end of it heats up, it pressurizes more and moves the needle. As for the oil pressure, I have no idea what it should be. I just know that is in a decent safe range for it. If you are really worried, get some plastigauge and check clearances.
Reply With Quote
  #5  
Old 01-11-2011, 01:05 AM
F-250 restorer's Avatar
F-250 restorer F-250 restorer is offline
Postmaster
 
Join Date: Mar 2008
Posts: 3,982
F-250 restorer has a good reputation on FTE.F-250 restorer has a good reputation on FTE.
Get the head magnafluxed for insurance. A lot of people prefer the mechanical gauge to the electric one.

Your oil psi sounds good. If it gets under 10psi, then I would worry. 20 is good.
__________________
http://bit.ly/P2P3ug
http://bit.ly/zpnFTl</a>.<font size=3>

[SIGPIC]
  #6  
Old 01-11-2011, 03:50 AM
|WYG|SS's Avatar
|WYG|SS |WYG|SS is offline
Senior User
 
Join Date: Sep 2009
Posts: 379
|WYG|SS is starting off with a positive reputation.
im not to worried about bearings, this bronco is just my mud truck so i can keep from wrecking my 93 f150 Daily driver.
__________________
1993 F150 4.9l 5spd 4x4, 128,000 miles.
NEW!! 1986 Bronco 4.9l 4spd Granny 4x4
Reply With Quote
  #7  
Old 01-11-2011, 04:19 AM
|WYG|SS's Avatar
|WYG|SS |WYG|SS is offline
Senior User
 
Join Date: Sep 2009
Posts: 379
|WYG|SS is starting off with a positive reputation.
i might aslo do the chevy rockers on their, and efi heads.

now with the efi exhaust heads can i just block off the hot air return to the intake and just have cold air sucked in through the carb?
__________________
1993 F150 4.9l 5spd 4x4, 128,000 miles.
NEW!! 1986 Bronco 4.9l 4spd Granny 4x4
Reply With Quote
Old 01-11-2011, 04:19 AM
Reply

Go Back   Ford Truck Enthusiasts Forums > Performance, Engines & Troubleshooting > Ford Inline Six, 200, 250, 4.9L / 300

Tags
1987, 300, 49, 49l, 94, correct, f150, ford, liter, litre, oil, pressure, pump, replacement, van

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On
Forum Jump



All times are GMT -5. The time now is 09:25 AM.


Powered by vBulletin® Version 3.7.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Advertising - Terms of Use - Privacy Statement - Jobs
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company.

vbulletin Admin Backup