Rebuilt 302 is overheating quickly
Thread Starter
|
More Turbo
Joined: Oct 2004
Posts: 621
Likes: 2
From: Marana, AZ
Your awesome hemieater!
I don't see a crack in your chambers on that pic? Where is it cracked at?
These are the tabs you are referring to?
I don't see a crack in your chambers on that pic? Where is it cracked at?
These are the tabs you are referring to?
Last edited by desertdave35; Dec 23, 2006 at 07:42 AM.
Thread Starter
|
More Turbo
Joined: Oct 2004
Posts: 621
Likes: 2
From: Marana, AZ
Ok so how were you able to get a 100psi in the cylinder and keep it there while you turned the motor over?
If I did a compression check on each cylinder would that tell me anything?
If I did a compression check on each cylinder would that tell me anything?
Postmaster
Joined: Jun 2005
Posts: 2,656
Likes: 1
it sure would, you should try that....
I made an adaptor that screwed into the spark plug hole. Took a spark plug and smashed the porciline (sp) out of it and braised an tube on it with a quick disconnect fitting, hook it up to my compressor @ 100 psi.
I made an adaptor that screwed into the spark plug hole. Took a spark plug and smashed the porciline (sp) out of it and braised an tube on it with a quick disconnect fitting, hook it up to my compressor @ 100 psi.
Thread Starter
|
More Turbo
Joined: Oct 2004
Posts: 621
Likes: 2
From: Marana, AZ
Ok, I'll go out do a compression check and see. How long should it hold the pressure before it bleeds down with the compression checker still attached?
Could I just hook up a tire inflator to my compression gauge and pump in air till it hits a 100 psi?
Could I just hook up a tire inflator to my compression gauge and pump in air till it hits a 100 psi?
Postmaster
Joined: Jun 2005
Posts: 2,656
Likes: 1
the compression test will only test the maximum pressure that the cylinder produced (125psi)
here's what you should do.unplug the power at the coil, if carb'ed wire the throttle wipe open, remove all the plugs and install the compression tester into #1 spark plug hole. If you can hook a remote starter switch to the starter cellinoid (sp) do so, if not have a friend work the key while you watch the rubber line on the compression tester. you want at least 3 hits from the cylinder being tested, watch the hose and it will swell just enough to indicate a compression stroke, some times they bounce all over the place.
write down all the pressures and go from there.
You might find that two cylinders side by side will be way down on compression and this would indicate a bad gasket.
as far as the 100psi test you need an air compressor, you can't pump up the cylinder like a tire.
here's what you should do.unplug the power at the coil, if carb'ed wire the throttle wipe open, remove all the plugs and install the compression tester into #1 spark plug hole. If you can hook a remote starter switch to the starter cellinoid (sp) do so, if not have a friend work the key while you watch the rubber line on the compression tester. you want at least 3 hits from the cylinder being tested, watch the hose and it will swell just enough to indicate a compression stroke, some times they bounce all over the place.
write down all the pressures and go from there.
You might find that two cylinders side by side will be way down on compression and this would indicate a bad gasket.
as far as the 100psi test you need an air compressor, you can't pump up the cylinder like a tire.
Last edited by HemiEater; Dec 23, 2006 at 08:20 AM.
Thread Starter
|
More Turbo
Joined: Oct 2004
Posts: 621
Likes: 2
From: Marana, AZ
I have an air compressor, I was think of hooking up the compression tester and then hooking up a tire inflater to the bleed off valve on the compression tester to pump the cylinder up to a 100psi, then crank the motor over. Does that make any sense?
Postmaster
Joined: Jun 2005
Posts: 2,656
Likes: 1
I think that would work but you might want to remove the gauge, it might brake it. You will have to hold the air supply on while you are turning it over. It should turn over and then stop on the compression stoke, keep the starter engaged for a few seconds. Make sure you remove the radiator cap and fill the system with water.
100psi at BDC is a lot of pressure normally is under a vacuume so when it comes up on compression psi must go to the moon just like when it fires.
100psi at BDC is a lot of pressure normally is under a vacuume so when it comes up on compression psi must go to the moon just like when it fires.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
Thread Starter
|
More Turbo
Joined: Oct 2004
Posts: 621
Likes: 2
From: Marana, AZ
Ok, did the compression test. These are dry values, didn't bother with the 2 squirts of oil. Some vary a little but its probably due to the rings have not seated fully yet since I only have about 20 mins of run time on the motor.
No. 7 is off the charts, the first test it went to 75 and held. The next test it went to 5, then next test it jumped to 25, then to 5 and finally to 80psi. What the hell is going on there?
Here are the results:
No. 7 is off the charts, the first test it went to 75 and held. The next test it went to 5, then next test it jumped to 25, then to 5 and finally to 80psi. What the hell is going on there?
Here are the results:
Thread Starter
|
More Turbo
Joined: Oct 2004
Posts: 621
Likes: 2
From: Marana, AZ
OK, I decided to do a wet test as well. I put a measured amount of 30wt oil in each hole just before testing that hole. It increased my psi any where from 3-5 psi on each hole except #7. It only got to 10 psi this time. The funny thing is, what ever it maxes out at it will hold that pressure till I release it. Thats whats got me baffled, if it were a bent valve or a stuck open valve it would bleed off very quickly.
Any ideas?
Any ideas?
