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AMC 401 First Startup Issues |
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348AMX 
AMC Addicted 
Joined: Jul/03/2007 Location: Massachusetts Status: Offline Points: 4165 |
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 Posted: Apr/09/2014 at 12:10pm |
It's HIGHLY unlikely that its the dampner, easy to check anyway when you are doing the TDC compression stroke verification with the distributor, you can check that, the distributor gear and the cylinder# 1 timming all at once. Also turn the engine over by hand when checking for TDC not with the remote starte, a wratchet with an extension is all you need it will be easy to turn with the plugs out....either use a length of pipe on the handle of the wratchet to be able to reach it and hold your thumb over the plug hole or have a helper turn the wratchet while you feel for the compression. |
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Boris Badanov
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Joined: Dec/14/2013 Location: NH USA Status: Offline Points: 4209 |
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Posted: Apr/09/2014 at 7:08pm |
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How are you inspecting the timing marks on the dampener?
if you are checking for TDC with an indicator and using a degree wheel
then another question begs.
Are your pistons stock or aftermarket?
AMC uses a .062 pin offset, using a piston with no offset
or installed backwards will have an effect on timing as well.
Boris Edited by Boris Badanov - Apr/10/2014 at 11:57am |
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Gremlin Dreams
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Peter D
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Joined: Feb/24/2014 Location: Webster NY Status: Offline Points: 36 |
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Posted: Apr/13/2014 at 1:41pm |
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Old school rule, if it backfires out the exhaust it's ignition / electric, if out the carb. its timing valve or cam. there are exceptions but I would start with timing
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71JAVVY
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Joined: May/07/2011 Location: Cda, Idaho Status: Offline Points: 184 |
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Posted: Sep/01/2014 at 1:52pm |
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Sorry this took so long but here's an update
I just got the thing fired and idling. After a ton of trouble shooting, it turns out I was getting inconsistent power from my solenoid used for my coil. I decided to check spark again and it just wasn't there like it was the first couple of times. It threw me for a loop. Also the cap full of gas to prime it worked great. I have since swapped the faulty solenoid it for a nice high quality continuous load solenoid that seems to be doing the job very well. Had it idling for a while, and starting tuning the carb a bit, when all of a sudden I had a rocker arm snap. If I remember correctly it was the intake on my #7 cylinder? Wondering if I have a stuck or bent valve. Going to inspect next time I go to the shop. What's the best way to hold the valve up while I pull the spring? Is the #7 piston at TDC enough or should I use air pressure as well? And are there any techniques you guys would recommend to try and unstick the valve without pulling the head? Hoping to try the easy solutions first.
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1971 Javelin
401, T-10, Ford 8.8 |
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Boris Badanov
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Joined: Dec/14/2013 Location: NH USA Status: Offline Points: 4209 |
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Posted: Sep/01/2014 at 2:09pm |
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If you are using aftermarket stock type replacements this is a common problem.
AMC factory replacements or quality roller rockers are the only way to go. I personaly have never seen an after market stamped steel rocker worth a hoot.
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Gremlin Dreams
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71JAVVY
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Joined: May/07/2011 Location: Cda, Idaho Status: Offline Points: 184 |
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Posted: Sep/01/2014 at 3:53pm |
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I'm actually using COMP 17044-1 roller rockers. The break was right across the end of the rocker covering the pushrod. Pushrod did not bend at all, but these are aluminum rockers so I'm hoping it a manufacturing defect.
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1971 Javelin
401, T-10, Ford 8.8 |
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Boris Badanov
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Joined: Dec/14/2013 Location: NH USA Status: Offline Points: 4209 |
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Posted: Sep/01/2014 at 4:46pm |
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Cast Aluminum i believe.
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Gremlin Dreams
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71JAVVY
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Joined: May/07/2011 Location: Cda, Idaho Status: Offline Points: 184 |
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Posted: Sep/01/2014 at 5:18pm |
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You're correct.
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1971 Javelin
401, T-10, Ford 8.8 |
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Orchuck
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Joined: Nov/27/2011 Location: Oregon Status: Offline Points: 222 |
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Posted: Sep/01/2014 at 7:03pm |
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http://www.carcraft.com/howto/ccrp_0801_302_valve_springs/
This article suggests compressed air or a length of nylon rope to keep the valve "Up".
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1969 Javelin SST, BBO, 390, Air, Auto PS/PB, Tilt, GoPac
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Rebel Machine
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Joined: Jul/03/2007 Location: Western Il Status: Offline Points: 5121 |
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Posted: Sep/01/2014 at 7:27pm |
Which intake valve? Should be cylinder #1, front driver's side. I looked at your video. Clearly there's a cylinder firing with an intake hanging open. How did you adjust the valvetrain? -Steve- Edited by Rebel Machine - Sep/01/2014 at 7:33pm |
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71Javelin wrote: