|
Sponsored Links (Register now to hide all advertisements) |
|
|
Thread Tools | Display Modes |
03-29-2020, 03:32 PM | #1 |
Senior Member
Join Date: Jul 2013
Location: La Porte, IN
Posts: 143
|
Cam spring and button
Had my engine overhauled by a reputable shop. Ever since I installed the engine back in the car, there is a loud knock when you are cruising. One member in our club had his engine redone at the same shop as I did. His engine started making a loud knocking also. The shop owner stated he had a batch of bad cam gears. I changed my cam gear even thou it didn't show any damage. Also installed a new spring and button. The knock is still there! I'm thinking could it be possible the spring isn't strong enough? Has anyone else experience this?
|
03-29-2020, 03:51 PM | #2 |
Senior Member
Join Date: May 2010
Location: Largo Florida
Posts: 7,225
|
Re: Cam spring and button
I've shimmed the spring before.
Have you checked the lash ? It should be around .004-.006". Over .010" will make noise. |
Sponsored Links (Register now to hide all advertisements) |
|
03-29-2020, 03:58 PM | #3 |
Senior Member
Join Date: Jul 2013
Location: La Porte, IN
Posts: 143
|
Re: Cam spring and button
I talked to the engine builder about the lash, the said when he rebuilt the engine, he uses a standard crank gear and standard cam gear. When I put the new gear on, he told me to use a standard cam gear.
|
03-29-2020, 04:40 PM | #4 |
Senior Member
Join Date: May 2010
Location: Oregon
Posts: 5,959
|
Re: Cam spring and button
Use the came gear that provides the correct gear lash. Always check with a feeler gauge if you are not certain. A repair of the bearings can make part relations change somewhat. Are you using a metal gear?
|
03-29-2020, 07:31 PM | #5 |
Senior Member
Join Date: May 2010
Location: Portland OR
Posts: 6,340
|
Re: Cam spring and button
Have you used a mechanics stethoscope to find where the sound is coming from? Run the engine without fan belt to eliminate the water pump. Did he pour fresh Babbitt in the mains? Mill the head or block too much and pistons are hitting?
__________________
I know the voices aren't real but damn they have some good ideas! |
03-29-2020, 07:51 PM | #6 |
Senior Member
Join Date: May 2010
Location: Oregon
Posts: 5,959
|
Re: Cam spring and button
Sponsored Links (Register now to hide all advertisements)
|
03-29-2020, 08:34 PM | #7 |
Senior Member
Join Date: Jul 2013
Location: La Porte, IN
Posts: 143
|
Re: Cam spring and button
I’m using the laminated gear, the builder installed modern bearings, no babbet. High compression head, fs ignition, 12 volt.
Last edited by fredski53; 04-01-2020 at 03:11 AM. |
03-29-2020, 09:11 PM | #8 |
Senior Member
Join Date: May 2010
Location: Oregon
Posts: 5,959
|
Re: Cam spring and button
delete
Last edited by J Franklin; 03-30-2020 at 12:27 AM. |
03-29-2020, 09:43 PM | #9 |
Senior Member
Join Date: May 2010
Location: Between Seattle & Tacoma
Posts: 2,354
|
Re: Cam spring and button
I like the cheap stethoscope from harbor freight. I take the metal end off and use a 3’ length of heater hose. I suppose you could just use the hose. Getting rid of the metal end stops excess metallic noise. You can locate the noise source quite well this way. I actually had a cam with a worn thrust and a weak spring that was knocking on the fly housing instead of on the timing cover. I knew the knock was coming from the rear, but it took a little time to figure out what was causing it.
|
03-29-2020, 10:17 PM | #10 |
Senior Member
Join Date: Mar 2012
Location: Addison,ll.
Posts: 453
|
Re: Cam spring and button
Does the knock occur when you first start up engine or after it has warmed up. Does it have a higher compression head?
|
03-29-2020, 10:48 PM | #11 |
Senior Member
Join Date: Jul 2013
Location: La Porte, IN
Posts: 143
|
Re: Cam spring and button
The knock is there as soon as you start the engine. Cold, warm makes no difference. Yes, high compression head. Right after I had the engine rebuilt, it made the knock, I talked to the rebuilder and he keeps saying too much advance in the timing. I've tried everything I can think of to do. Someone said try a colder spark plug. I'm at the point of just keep running the darn thing, and when something breaks, well, then I'll know what was wrong!
|
03-30-2020, 12:00 AM | #12 |
BANNED
Join Date: Dec 2019
Posts: 1,196
|
Re: Cam spring and button
Ive done two things to cure the issue,one was drill and tap the timing cover and use a set screw inplace of the cam spring.the other was to use a harmonic balancer
|
03-30-2020, 07:45 AM | #13 |
Senior Member
Join Date: Jun 2014
Location: Land of Lincoln
Posts: 3,127
|
Re: Cam spring and button
I just cured an engine noise in the areas that you have. My old distributor had a single shaft instead of the original two piece shaft. I feel the drive gear at the end of the shaft was moving around causing my noise. My noise was at both ends of the cam, front side near the cam gear and at the rear near the exhaust.
__________________
Don't force it with a little hammer tap, tap, tap get a bigger hammer tap done |
03-30-2020, 11:47 AM | #14 | |
Senior Member
Join Date: Jun 2015
Location: Red Deer, Alberta
Posts: 5,042
|
Re: Cam spring and button
Quote:
__________________
If you don't hear a rumor by 10 AM, start one!. Got my education out behind the barn! |
|
03-30-2020, 03:22 PM | #15 |
Senior Member
Join Date: Jul 2013
Location: La Porte, IN
Posts: 143
|
Re: Cam spring and button
Snyder sell the laminated cam gear. It's supposed to be better then the macerated one.
Last edited by fredski53; 04-01-2020 at 03:10 AM. |
03-30-2020, 03:36 PM | #16 |
Senior Member
Join Date: Mar 2014
Location: Midland Park,N.J.
Posts: 1,108
|
Re: Cam spring and button
possibly to much forward and aft movement in the crank,something I would check.
|
03-30-2020, 04:14 PM | #17 |
Senior Member
Join Date: May 2010
Location: on the Littlefield
Posts: 6,156
|
Re: Cam spring and button
What about the other guys car--- has that been fixed---- has either of the cars been inspected by the guy that did the work
|
03-31-2020, 04:12 AM | #18 |
Senior Member
Join Date: Jul 2013
Location: La Porte, IN
Posts: 143
|
Re: Cam spring and button
I haven't talked to the club member since our last club meeting. Like I said before, I called the guy who did the engine work and he keeps saying its spark knock because of the electronic ignition and high compression head. I remember I had to buy a new lower shaft for the distributor. I was reading the " Red Book" and it said something about the 2 piece shaft connecting slot may need to be filed (opened) slightly to eliminate binding on the shaft. Also if a knocking noise (similar to a timing gear knock) is heard after installing a rebuilt distributor, try loosing the side locking screw to eliminate binding on the shaft.
|
03-31-2020, 10:50 AM | #19 |
Senior Member
Join Date: Jun 2015
Location: Red Deer, Alberta
Posts: 5,042
|
Re: Cam spring and button
"Lamented", adjective, a conventional way of describing someone who has died or something that has been lost or that has ceased to exist.
__________________
If you don't hear a rumor by 10 AM, start one!. Got my education out behind the barn! |
03-31-2020, 11:04 AM | #20 |
Senior Member
|
Re: Cam spring and button
I once saw the same problem. Turns out that the line bore of the crank was slightly off center towards the cam. It made for a very tight fit between the crank and cam gears. I agree you should check the gear lash.
|
04-01-2020, 07:05 AM | #21 |
Senior Member
Join Date: Jul 2015
Location: SouthWest Michigan
Posts: 363
|
Re: Cam spring and button
check crank end play, make sure crank is not moving for and aft
reset timing to make sure that is not it, with a light if possible |
04-01-2020, 11:58 AM | #22 |
Senior Member
Join Date: May 2010
Location: Santee Calif.
Posts: 507
|
Re: Cam spring and button
Light pressure on the clutch pedal with the engine running will stop the crankshaft from moving back and forth if thats whats making noise it should stop or at least change in tone
|
Sponsored Links (Register now to hide all advertisements) |
|
|
|
Sponsored Links (Register now to hide all advertisements) |
|