460 having some trouble
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Mountain Pass
Joined: Sep 2017
Posts: 200
Likes: 0
460 having some trouble
I have a 1975 f-250 with a freshly rebuilt 460. It runs great but only has one problem. After it heats up (not over heat) the engine has some trouble starting but when the engine is cold it starts great.
I figured it might be timing or my starter is just going out. Also after it warms up and turn the key to start it doesn't crank for a few seconds then does just fine. If there are any other questions I'm happy to answer.
I figured it might be timing or my starter is just going out. Also after it warms up and turn the key to start it doesn't crank for a few seconds then does just fine. If there are any other questions I'm happy to answer.
Post Fiend
Joined: Apr 2002
Posts: 19,311
Likes: 97
From: Waterloo, Iowa
Heat buildup from engine & exhaust can make starting much more difficult when the starter soaks it up compared with a cold start. Make sure charging system/battery is up to snuff and fresh manufacture heavy duty cables and good grounds, the undersized el-cheapo cables commonly sold these days don't help.
Fleet Mechanic
Joined: Jul 2013
Posts: 1,997
Likes: 237
From: NE Ohio
What are the steps/details to test? Hook up the battery tester flip the switch and see what it registers?
Post Fiend
Joined: Apr 2002
Posts: 19,311
Likes: 97
From: Waterloo, Iowa
Then apply a load to the battery with the carbon pile to achieve that same voltage indicated, and note the current draw. Bounce the current draw measured off the starter draw specification listed in the manual.
A starter on a V8 might draw anywhere from 100 to 200 amps depending on engine size and compression ratio, ignition timing etc, but when they start to go on the way out they will exceed their rating by quite a bit. A good, serviceable engine starter will always draw well under the max. current listed in the manual.
