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AMC 401 starter problem |
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jjubinsky
AMC Fan Joined: Oct/21/2010 Location: temecula ca Status: Offline Points: 17 |
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Posted: Feb/08/2012 at 8:24pm |
Hello all, 1st posting here. I picked up a 1967 M715 pickup with a 401 mated to the orig. T98 trans.
I started haveing a problem with the starter grinding against the ring gear. I have tried two different starters with the same result. If I shim the starter so it is not flush with the bellhousing, pushing the starter gear closer to the ring gear, I can get the starter to engage the ring gear. This works for a while but eventually it F's up the starter gear. I did not build the truck so I dont know the year engine or what it came out of. What I have learned is that there are two different size flywheels and ring gears for the 401. Both are 164 teeth. I have the smaller diameter flywheel and ring gear. The conclusion I draw is that either I have the wrong flywheel/ring gear or the wrong bellhousing. I do not know if there are different bellhousings for the 401 but I was thinking that maybe the smaller ring gear had a bellhousing to match and the bigger vice versa. As the bellhousing I have already has an adaptor plate to my tranny I would think I would need to stay with this bellhousing. Sorry for the long post, just tryin to give as much as I know. Any info on what the difference on the flywheel size and what the engine may be out of is appreciated. thanks
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madmax
AMC Nut Joined: Sep/18/2008 Location: grain valley,mo Status: Offline Points: 401 |
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does it have the block plate between the engine and trans? it is used to locate the starter as one of its primary functions.
i have seen several left out and had similar starter issues that you are describing.
as far as i know all amc flywheel/flexplates are 164 tooth
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American Heavy Metal
restoration parts and mechanical restoration services 70 amx black 1968 kaplan amx ss/racecar 1969 amx racecar 1970 trans am javelin 1969 amx white/platinum 1972 gremlin |
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jjubinsky
AMC Fan Joined: Oct/21/2010 Location: temecula ca Status: Offline Points: 17 |
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Not sure what a blockplate is.
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FuzzFace2
AMC Addicted Joined: Jul/05/2007 Location: Angier, N.C. Status: Offline Points: 10356 |
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First off Welcome to the form. Now to the issue, As far as I know, and I dont know it all, all the fly wheels & flex plates for the auto trans are the same dia. Bell housings either bolt to the motors or not starter openings should be all the same even between 6 & 8 housings. Also believe the 6 & 8 starters are the same or close enough to use in either one.
Now not knowing Jeeps too well didnt the M715 come with a 6? Even if it came with a 8 back in 67 I think it would have been a 327. One way to fine the year of the 401 if it has the stock valve covers on there should be a metal tag screwed to the front of the right cover. Post up the numbers/letters and someone will find what it is. Just know the covers could be from another motor from 304 on up.
Back to the starter, can you post a picture of it? Also does it have the solanoid part of the starter or is that on the fender? 1 wire to the uint or more? What side is it on?
That is all I can think of for now.
Dave ----
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FuzzFace2
AMC Addicted Joined: Jul/05/2007 Location: Angier, N.C. Status: Offline Points: 10356 |
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Dave ----
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6PakBee
Supporter of TheAMCForum Charter Member Joined: Jul/01/2007 Location: North Dakota Status: Offline Points: 5457 |
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In the upper right hand corner next to the headlight buckets, that's a block plate.
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Roger Gazur
1969 'B' Scheme SC/Rambler 1970 RWB 4-spd Machine 1970 Sonic Silver auto AMX All project cars. Forum Cockroach |
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jjubinsky
AMC Fan Joined: Oct/21/2010 Location: temecula ca Status: Offline Points: 17 |
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OK. no block. What does this block do?
And no, this is not the stock engine, but it is the stock manual trans. The starter is on the passenger side with solenoid on starter and single wire.
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madmax
AMC Nut Joined: Sep/18/2008 Location: grain valley,mo Status: Offline Points: 401 |
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pics may help, some aftermarket mini starters have the solinoid on the starter with 1 wire.
is there a adapter of some sort to mate the engine with the original trans?
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American Heavy Metal
restoration parts and mechanical restoration services 70 amx black 1968 kaplan amx ss/racecar 1969 amx racecar 1970 trans am javelin 1969 amx white/platinum 1972 gremlin |
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FuzzFace2
AMC Addicted Joined: Jul/05/2007 Location: Angier, N.C. Status: Offline Points: 10356 |
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If no plate you ned to get one and install it, that could fix it.
Sounds like someone used a bell that fits the 401, could the stock Jeep one work? and it had the right bolt pattern on the trany side but need a spacer between bell & trany. I know that spacer was stock on some Jeeps and certin stick tranys.
Dave ----
We also want to see pictures of the Jeep too
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jjubinsky
AMC Fan Joined: Oct/21/2010 Location: temecula ca Status: Offline Points: 17 |
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The 401 is mated to the t98 trans with an adaptor plate between the trans and bellhousing. The starters I have been using are stock for a 401. I did not build this truck and dont know how it was put together. Not knowing the year of the engine or what it came out of, Napa gave me a starter for a 70's matador.
As Napa shows two diameter size flywheels and ringgears for the 401, and if there is only one bellhousing, which would mean the starter is "set"in the same location for either diameter, then it follows that there would be two different starters. The starter gear that engages the ring gear would be larger for the smaller ring gear and smaller for the larger ring gear. Make sense?
The two ring gear sizes, according to Napa, outside diameter 13.75 & 13.81. Not a big difference but it could account for why my starter gear does not engage my ring gear.
Without knowing the year of my engine, we could not determine what size flywheel and ringear I should have for my engine. Again, I have been useing a stock 401 starter from a Matador.
I will look again for a tag on the engine but did not see one previously. thanks
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