460 Timing & EGR
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Tuned
Joined: Aug 2002
Posts: 263
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From: USA
460 Timing & EGR
Hello all. Wondering if you guys can help with my other Ford. It's a '77 Linc with a 460. The eng. sticker says the timing is supposed to be 16 deg. BTDC. Is this correct!? It seems really high since the 302 & 351's back then were about 6 BTDC. Also will an EGR that's stuck open cause the eng. to run hot? I've replaced the thermostat and fan clutch, starting to get frustrated!! 
Thanks in advance for the help
Thanks in advance for the help
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Tuned
Joined: Aug 2002
Posts: 263
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From: USA
460 Timing & EGR
Thanks, I'm going to change the EGR and reset the timing to 16. I also noticed the air snorkel door is drawing closed at the end. This door causes the eng. to get heated air from the exh. manifold by way of that aluminum tube when its cold out (mine isn't connected though). So I'm hoping EGR has something to do with it pulling vacuum while the engine is hot. I'd appreciate any opinions or thoughts though. I still don't understand what the EGR does. My shop manual talks very little of the principal behind and EGR Thanks,
Moderator
Joined: Dec 2001
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From: Louisville,Ky.
460 Timing & EGR
[updated:LAST EDITED ON 28-Aug-02 AT 01:45 AM (EST)]If the snorkle door is closed after the engine is warmed up and has been running at least 10 minutes with the air cleaner lid on, then the thermoswitch on the air cleaner is probably bad. It is supposed to open when the air temp in the aircleaner reaches about 60 degrees.
The 77 Mark V that my 460 came out of said 16 degrees too, but it runs best at about 10.
The 77 Mark V that my 460 came out of said 16 degrees too, but it runs best at about 10.
Cargo Master
Joined: Apr 2001
Posts: 2,364
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From: Eustis FL
460 Timing & EGR
Yeah, that snorkel flapper should be held shut by engine vaccum on cold startup. With the heat from the exhaust heat riser, the thermal spring in the flapper should pull it open, regardless of engine vacuum. There is sometimes a one-way valve (biscuit looking thing, blue and white)that is in that vacuum line. It hold vacuum there for the flapper, in case you want to take off while the engine is still cold.
Mark
https://www.ford-trucks.com/user_gallery/displaythumbnail.php?&photoid=5362&.jpg
Ford started it; Ford will finish it!
Mark
https://www.ford-trucks.com/user_gallery/displaythumbnail.php?&photoid=5362&.jpg
Ford started it; Ford will finish it!
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From: Louisville,Ky.
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Thread Starter
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Tuned
Joined: Aug 2002
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From: USA
460 Timing & EGR
Thanks all for the help. This was one of those head scratchers where you just stare at the motor hoping it will tell you what to do to it.
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From: On the farm near Loveland
460 Timing & EGR
> I
>still don't understand what the EGR does. My shop manual
>talks very little of the principal behind and EGR Thanks,
The EGR system adds a small amount of exhaust gas to the fuel-air charge in the cylinders. That reduces nitrogen oxide (NO2)emissions by keeping the temperature down in the cylinders as the fuel burns.
A properly working EGR system is only in operation at part throttle, never at idle or at full throttle. If it fails so that exhaust gas is never going into the engine, it can cause pinging which you have to correct by retarding your timing or using higher octane fuel. If it fails stuck open all the time, it'll usually give you a rich or rough idle.
Best,
-Bill in Colorado
>still don't understand what the EGR does. My shop manual
>talks very little of the principal behind and EGR Thanks,
The EGR system adds a small amount of exhaust gas to the fuel-air charge in the cylinders. That reduces nitrogen oxide (NO2)emissions by keeping the temperature down in the cylinders as the fuel burns.
A properly working EGR system is only in operation at part throttle, never at idle or at full throttle. If it fails so that exhaust gas is never going into the engine, it can cause pinging which you have to correct by retarding your timing or using higher octane fuel. If it fails stuck open all the time, it'll usually give you a rich or rough idle.
Best,
-Bill in Colorado
