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Wat piston is paired to cylinder #1 in a 351W?
#615219 May 11th 2013 12:07 pm
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I want to verify that my vibration dampener has the timing marks in the correct lace. In other words, I want to verify that my motor is actually at TDC when the timing marks say it is at TDC. My original damper disintegrated back in 2010 when I swapped motors, and I don't have 100% belief that the new damper is indexed correctly. The cylinder #1 spark plug is a pain to get at on my van, so I want to use the cylinder on the driver's side of the motor that is matched to piston #1, but I don't know which one it is. The firing order suggests it is piston #6, but can anyone confirm that? Thanks.


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Re: Wat piston is paired to cylinder #1 in a 351W?
Reed #615293 May 11th 2013 6:02 pm
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As far as I know top dead center is only matched to the #1 cylinder.


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Re: Wat piston is paired to cylinder #1 in a 351W?
Reed #615299 May 11th 2013 6:32 pm
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OK, a simple diagram take your firing order and split it into 2 lines 1-4/5-8, there are 2 cylinders paired, but they are in different strokes, going the same direction, one in the compression while the other on the exhaust, the v-6 engines are offset a few degrees for balance, won't work for them, this is from engine basics at Nashville Auto Diesel College. Good luck.

Re: Wat piston is paired to cylinder #1 in a 351W?
Reed #615328 May 11th 2013 10:04 pm
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351w fireing order is 13726548 so the cyl you are looking for is #6 second cyl back on drivers side. Doc Yukon said that.


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Re: Wat piston is paired to cylinder #1 in a 351W?
Reed #615378 May 11th 2013 11:41 pm
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That is what I figured. #1 at TDC on compression stroke when #6 at TDC on exhaust stroke. Yay. Much easier to get a piston stop tool into #6 than #1.


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Re: Wat piston is paired to cylinder #1 in a 351W?
Reed #615567 May 12th 2013 10:15 pm
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Glad it worked out for ya, it's funny on the inline 6 engines, seeing them at work with the head off.
It'll not be perfect, but get you close.

Last edited by maples01; May 12th 2013 10:16 pm.
Re: Wat piston is paired to cylinder #1 in a 351W?
Reed #615578 May 12th 2013 10:51 pm
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Being that the inline engines are inline, it makes it easier to visualize since you can watched the matched pairs work. For example, my familiarity with slant sixes is what gave me this idea. THe cylinders are numbered 1-6 from front to back. The firing order is 1-5-3-6-2-4 and I know that cylinder 1 and 6 are tied in position but 180 degrees opposite in the four stroke cycle. I figured it had to be similar with a v-8 engine due to balancing the vibrations from the firing order, so i figured chopping the firing order in half would give me the matched piston.

When I get my van back from the shop replacing the axles I am going to verify that my timing is set correctly and cylinder #1 is a PITA to get to.


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Re: Wat piston is paired to cylinder #1 in a 351W?
Reed #615580 May 12th 2013 11:06 pm
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What are you doing to the axles in it?
Yeah, V6 owners aren't in such luck, the journals stagger, to make them run smoother, I had no idea till I saw one back in 92 in the shop.

Re: Wat piston is paired to cylinder #1 in a 351W?
Reed #615583 May 12th 2013 11:11 pm
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Last year I paid a shop to completely rebuild the front suspension and steering assemblies on my van, including pressing in new kingpins. They neglected to tell me that the holes in the axles for the kingpins were worn beyond their safe limit (or they completely destroyed them putting the kingpins in wrong). My van had a horrible dead spot ever since I got it back from them. They told me the parts had to wear in. So I drove the van for over 5000 miles and the steering got steadily worse. I finally took the van in to a shop that services big semi trucks and they discovered that the kingpin holes in both front axles were worn beyond use.

So, the short answer is the axles are being replaced and new kingpins are being installed.


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