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05-26-2014, 01:47 PM
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#1 |
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Registered User
Join Date: Dec 2003
Location: nor cal
Posts: 219
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Ticking noise under load?
Just got everything together and on the road. Rebuilt engine, new TH400 trans from Summit. When I jump on the gas I get a ticking noise that sounds like it is coming from the trans area.
I read that sometimes the flexplate can rub the starter under load. I have a GM performance mini starter. The clearance between the pinion and flexplate is .04 (which is the smallest the directions call for). Would be cheap to get the shim kit to increase the clearance... anyone think this is the problem? I get zero noise when in neutral all the way up to 3500 rpm. Same if I put it in gear and hold the brake. It is a standard bore 350 with cast iron Vortec heads and my timing is set at @8 deg. Really don't think it is exhaust or valves since there is no noise when not driving. |
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05-26-2014, 02:48 PM
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#2 |
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Registered User
Join Date: Jul 2012
Location: Maple Ridge. B.C.
Posts: 145
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Re: Ticking noise under load?
Is it possible you have a cracked flex plate?
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05-26-2014, 03:43 PM
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#3 |
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Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,228
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Re: Ticking noise under load?
It could be an exhaust leak at one port.
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09-06-2017, 04:58 PM
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#4 | |
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Registered User
 Join Date: Jul 2015
Location: 2nd left past the stump on a dirt road.
Posts: 2,629
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Re: Ticking noise under load?
Quote:
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09-06-2017, 05:17 PM
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#5 |
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Moderator
 
Join Date: Jun 2017
Location: Cherryville, NC
Posts: 2,204
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Re: Ticking noise under load?
Glad you fixed the issue...but ....
Make sure the starter motor has the additional support bracket on the end of the motor that goes back to the engine block... I dont know how many blocks I have had to repair because of this $ 5 piece of steel... 
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09-06-2017, 08:12 PM
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#6 | |
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Registered User
Join Date: Jul 2015
Location: 2nd left past the stump on a dirt road.
Posts: 2,629
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Re: Ticking noise under load?
Quote:
Never looked for one of those, Is it common at the Auto parts stores? GMC Paul's I would bet. |
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09-06-2017, 08:17 PM
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#7 |
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Moderator
Join Date: Jun 2017
Location: Cherryville, NC
Posts: 2,204
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Re: Ticking noise under load?
http://sdparts.com/i-19887150-gm-fac...IaAiX6EALw_wcB
$ 10... plus the bolt...its a 3/8 UNC x 5/8" long
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05-26-2014, 04:54 PM
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#8 |
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Registered User
Join Date: Apr 2012
Location: Stillwater, Oklahoma
Posts: 874
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Re: Ticking noise under load?
Bent speedometer cable?
__________________
1971 C/10 SWB, 15x8 Rallys, 4.5" X 7" static drop, C-notched, 350/350, 3.73 Posi. .........A 383 and Gear Vendors are on my bucket list. 1972 GMC 4X4 K1500 Survivor - Sold No matter what problems life throws at you, your time on Earth can be incredibly fulfilling and rewarding.....if you just lower your expectations. -Phil Dunphy |
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05-26-2014, 05:42 PM
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#9 |
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Registered User
Join Date: Jul 2013
Location: Phoenix, AZ
Posts: 348
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Re: Ticking noise under load?
Could be your distributor. Don't know what kind you have but some you can adjust the vacuum canister with an Allen wrench in the end of the canister. Or the weights inside the dist might be off but you can get springs and weights to fix that. Had similar probs recently.
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05-26-2014, 05:51 PM
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#10 |
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Registered User
Join Date: Dec 2003
Location: nor cal
Posts: 219
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Re: Ticking noise under load?
Thanks for all the help.
Just got done checking the flex plate. Removed the TC bolts and slid it back to look with a flashlight. No cracks that I could see. When I turned the flexplate to look at all the bolts I notices the flexplate closes the gap on the starter pinion to almost zero in one spot. This means the flexplate is not entirely flat (.045 to 0 at the pinion) Does that mean I need a new one? ($$$) Will go look at the plugs now. Still gonna try all the cheap fixes before breaking out the credit card I remember a friend who had a bad speedo cable, it made that noise when pushing it out the driveway... mine doesnt make any noise when pushing it around. |
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05-26-2014, 05:38 PM
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#11 |
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Registered User
Join Date: Jan 2011
Location: Chattanooga, TN
Posts: 1,108
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Re: Ticking noise under load?
It could be detonation from low quality/low octane gas or ignition timing/advance, too. The engine tries to "pre-ignite" the fuel charge due to elevated temperatures in the cylinder. Maybe the spark plug tip remains hot enough to cause this condition?
I would check out your spark plugs and see if they have the appearance of the "OVERHEATED" spark plug in the photo attached. POP
__________________
2016 RAM Laramie HEMI 1966 Fairlane GT/A, 390/335 HP If it costs you a dollar to make a friend, KEEP THE DOLLAR. If it costs you a friend to make a dollar, KEEP THE FRIEND. |
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05-27-2014, 05:06 PM
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#12 |
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Registered User
Join Date: Jul 2012
Location: White Salmon, WA
Posts: 263
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Re: Ticking noise under load?
New flexplate might be in order. You could cerainly use a shim at your starter anyways. .01 is about where you want to be anyways. May just start there as it could at least get rid of the sound you mention. The stresses under load may cause the 0 clearance pportion to touch.
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05-28-2014, 07:34 PM
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#13 |
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Registered User
Join Date: Dec 2003
Location: nor cal
Posts: 219
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Re: Ticking noise under load?
Problem solved! Thanks for all the replies.
The shim kit did the trick. I would have never thought about the starter hitting the flexplate but as usual spending late nights on this site payed off again. How did us amateurs get anything done before the World Wide Interweb? |
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09-06-2017, 04:53 PM
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#14 | |
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Registered User
Join Date: Dec 2012
Location: Heart of Tennessee
Posts: 1,120
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Re: Ticking noise under load?
Quote:
I checked everything but....... runs great crate 290hp, 72 Blazer. |
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