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Timing Chain
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Official CCB Member   Joined: Mon Feb 14, 2011 10:29 am Posts: 768 Location: The MHC 
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 Timing ChainSo...I got started doing my Explorer EFI conversion Saturday by disassembling my motor down to basically the small block. I noticed the timing chain may have excessive slack in it. I turned the motor to #1 TDC and with the chain tight on the driver side, I have approximately 3/4" of play on the opposite side. This motor only has about 40-50K on it. Time for replacement? If so, what to buy? I at least know I don't need to install the fuel pump eccentric if replaced.
Thoughts? _________________ Wilma - 71 1/2 Wagon; 3 1/2" WH lift, 1" BL, NP435, Chebby disc front, WH twin stick D20, EFI 302, Cool hood scoop, mucho cancer; purchased in 1990. |
| Mon Feb 02, 2015 10:03 am |
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Official CCB Member  Joined: Thu Oct 25, 2012 9:33 pm Posts: 2460
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Re: Timing Chain I just bought this one (http://www.jegs.com/i/COMP+Cams/249/2138/10002/-1) to replace mine. Also-- so you don't make the same mistake I did-- when eliminating the fuel pump eccentric-- make sure you still attach the bolt and washer to the gear and cam.
_________________ 69 Wagon, 351W, Explorer EFI & Serpentine, ZF5, 35" tires, 3.5 SL, 2 BL, WARN 8274 |
| Mon Feb 02, 2015 11:04 am |
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Official CCB Member  Joined: Tue May 07, 2013 10:37 pm Posts: 1485
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Re: Timing Chain 3/4" sounds like it's at it's useful limit. Timing chains are cheap.
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| Mon Feb 02, 2015 2:47 pm |
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Official CCB Member  Joined: Wed Oct 27, 2010 6:25 pm Posts: 4901 Images: 0 Location: Colorado Springs
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Re: Timing Chain X2. It's open already. Might as well get another 100k out of the motor by replacing it.
_________________ Stroppe'd 1972 Sport, 302, 3 speed with old school Duff floor shifter, T shift Dana 20 with JB Fab twin stick, 4.11 gears with Trac-loc, Lincoln hydroboost, Chevy disc conversion, WH gas lift gate shock kit, 33" Duratrac tires on slots and about 2.5" of lift, Stroppe installed: bumper braces, dual shocks on all four corners, GM power steering, trans cooler mount, auto shift column, rollbar. The Terrible One 1972 Sport uncut, 302, C4 with 1974 column , T shift Dana 20, 3.50 gears w/ limited slip, 1966 U13 Roadster kick panel, and factory power steering. 1973 Stroppe Baja project |
| Mon Feb 02, 2015 5:20 pm |
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Official CCB Member Joined: Mon Feb 14, 2011 10:29 am Posts: 768 Location: The MHC
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Re: Timing Chain Measured again last night and I'm at or near the 1/2" play required for replacement. So which do I get? Double roller? True Roller? Something cheap? Billet sprockets? I've never bought one before. I'm surprised (but really not) that this chain only lasted 40-50K. I want to install something that's going to last at least 80K miles!
_________________ Wilma - 71 1/2 Wagon; 3 1/2" WH lift, 1" BL, NP435, Chebby disc front, WH twin stick D20, EFI 302, Cool hood scoop, mucho cancer; purchased in 1990. |
| Tue Feb 03, 2015 9:02 am |
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Official CCB Member  Joined: Wed Sep 29, 2010 10:03 pm Posts: 4371 Images: 0 Location: Parker, CO
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Re: Timing Chain It's the chain that wears, so a double roller would likely last longer. Not sure what benefit billet sprockets would add, bling maybe.
_________________ Best to Date MPG: 26.6 |
| Tue Feb 03, 2015 10:03 am |
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