CtheNationsBeauty
Webster
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Joined: 01/22/2012
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Hi, i had to replace my water pump on my 1985 Class C Feetwood Tioga. It has a 460 v-8 engine (7.5L). I replaced the spark plug wires, being sure to follow the wiring that was already on the distributor cap. I did not think that wiring was correct and looked it up it two books for ford engines. I rewired it accordingly for a 460 engine. I tried to start the motor home and it sputtered and back fired and I knew it was wrong. I again looked it up and I do not understand why it is wrong. Has this been changed? Or am I looking at new wiring for an older engine rather than the proper wiring for this specific engine? Any help will be most appreciated.
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dadechil
Georgia
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Joined: 05/31/2009
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1 - 5 - 4 - 2 - 6 - 3 - 7 - 8
The distributor rotor turns COUNTERCLOCKWISE
The marked # 1 position on the distributor cap faces to the REAR and slightly towards the drivers side
The engine cylinders / spark plug locations are numbered :
firewall
4 - 8
3 - 7
2 - 6
1 - 5
front
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weasel4
Alberta
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Joined: 07/06/2003
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All you can do is bring #1 up to TDC and make sure it is pointing to the #1 post on the cap. Other than that, was the distributor moved while the change was taking place?
BTC
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Normk
Canada's Wet Coast
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Joined: 01/24/2010
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If someone pulled the distributor, they may have simply repositioned the plug wires to match the new #1 location, as weasel4 stated. Find #1 compression stroke and turn to the firing mark or TDC which should be close enough and inspect the rotor location for #1 position.
If you lack a TDC whistle, use a remote starter and use a finger or thumb to restrict the #1 plug hole. Bump the engine in small increments until you feel the compression pulse and then rotate to TDC by the marks.
An easier alternative is to turn the engine to the firing marks and install the plug wires to match this postion. If it doesn't work out, move the wires 1/2 turn. You can get an idea as to whether this is the case by noting the piston "rock over" position and comparing to the timing marks for TDC.
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PaulJ2
Northwest Oregon
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Joined: 12/23/2005
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A good way to avoid all this I have found is to--replace each wire one at a time. Then it doesn't mater how the PO had it wired before.
Like above stated, you need to find #1 position. Remember that when timing mark is at zero the rotor will either point to #1 OR #6. If at #6 just rotate engine one more time.
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CtheNationsBeauty
Webster
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Joined: 01/22/2012
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Many of the engines I had previously worked on always had even on one side, and odd on the other side. In this case the cylinder numbers are what threw me off. I was able to obtain a copy of the proper wiring and cylinder numbers. With this I rewired the spark plugs. She fired up immediately. After fixing a no fuel problem. The seal on the fuel filter was leaking and the pump needed to be primed again. I set the floats on the carberator bowls and started the engine again. She ran beautifully. No leaks from water pump or any where else. Better than when I bought it last December. I am almost ready to go. This weekend is looking real good.
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