10-04-2020, 08:39 AM | #1 |
Senior Member
Join Date: Jul 2018
Location: Ottawa, Ont Canada
Posts: 161
|
vibration
vibration when car is running in neutral
gets worse when you rev it up like a pressure plate or fly wheel issue HOW DO I RULE OUT FLAT CAM SHAFT LOBES ? |
10-04-2020, 08:55 AM | #2 |
Senior Member
Join Date: May 2010
Location: Eastern Iowa
Posts: 350
|
Re: vibration
The most overlooked vibration issue is the harmonic balancer.
|
Sponsored Links (Register now to hide all advertisements) |
|
10-04-2020, 03:28 PM | #3 |
Senior Member
Join Date: Jul 2018
Location: Ottawa, Ont Canada
Posts: 161
|
Re: vibration
good point
is there a way to check harmonic balancer |
10-04-2020, 09:41 PM | #4 |
Senior Member
Join Date: Mar 2013
Location: Kent, WA. Tucson, AZ
Posts: 1,374
|
Re: vibration
We can guess at what engine you've got, but knowing the engine and transmission will help you get responses. And improve the likelihood of which ones are most likely.
|
10-05-2020, 06:15 AM | #5 |
Senior Member
Join Date: Sep 2014
Posts: 160
|
Re: vibration
If this is something you just bought, and it has the small block V8, could be somebody put an inline 240 or 300 flywheel on it.
|
10-05-2020, 06:31 AM | #6 |
Senior Member
Join Date: Jul 2018
Location: Ottawa, Ont Canada
Posts: 161
|
Re: vibration
Sponsored Links (Register now to hide all advertisements)
and i do not know history of the car |
10-05-2020, 07:49 AM | #7 |
Senior Member
Join Date: May 2012
Location: Middle TN
Posts: 1,060
|
Re: vibration
Then it has a damper, not a harmonic balancer. The damper can be problematic if the rubber has begun to deteriorate but usually they begin to make noise as the outer ring loosens and slips. If that's the case they are rebuildable. Damper Doctor and the Damper Dudes are the usual suspects for rebuilds.
__________________
Often wrong but never in doubt. |
10-05-2020, 02:20 PM | #8 |
Senior Member
Join Date: May 2010
Location: Granite City, Illinois
Posts: 3,008
|
Re: vibration
I would check to see if each spark plug is firing using an inductive timing light first before condemning crankshaft damper. It is fast and easy to rule out misfiring or dead cylinders.
|
10-06-2020, 07:50 AM | #9 |
Senior Member
Join Date: Jul 2018
Location: Ottawa, Ont Canada
Posts: 161
|
Re: vibration
all the plugs are burning even what do i look for with timing light or what is a good sign- bad sign
|
10-06-2020, 07:59 AM | #10 |
Senior Member
Join Date: Jul 2018
Location: Ottawa, Ont Canada
Posts: 161
|
Re: vibration
i had damper off when i changed timing chain ,looked OK
what difference will a 240 / 300 flywheel make |
10-07-2020, 12:52 PM | #11 |
Senior Member
Join Date: Aug 2012
Location: IN A 'GALAXIE' FAR FAR AWAY
Posts: 6,416
|
Re: vibration
Quick way to determine if balancer is good is to check static timing outer ring position with a piston stop.
|
10-10-2020, 07:02 AM | #12 |
Senior Member
Join Date: Aug 2014
Posts: 721
|
Re: vibration
Could be a loose or bent fan blade. Remove the fan belt and run it for a quick 30 seconds.
|
10-10-2020, 08:14 AM | #13 |
Senior Member
Join Date: Dec 2011
Location: Oakville Ontario
Posts: 586
|
Re: vibration
make sure the plug wires are on in right order
|
10-10-2020, 11:35 AM | #14 |
Senior Member
Join Date: Jul 2018
Location: Ottawa, Ont Canada
Posts: 161
|
Re: vibration
how do you check motor mounts
they are not broken but can they dry up and how about the front by the rad |
10-10-2020, 09:13 PM | #15 | |
Senior Member
Join Date: May 2010
Location: Granite City, Illinois
Posts: 3,008
|
Re: vibration
Quote:
The front engine steady rest is likely inconsequential since many people are leaving them off altogether (but I do not recommend that). The condition of motor mounts is unrelated to how the engine runs. |
|
10-10-2020, 09:24 PM | #16 | |
Senior Member
Join Date: May 2010
Location: Granite City, Illinois
Posts: 3,008
|
Re: vibration
Quote:
Connect battery leads (red to positive, black to negative). Wrap the inductive clamp around spark plug #1 cable as near to spark plug boot as possible. start engine and run at idle. Pull the trigger on the timing light. If light flashes, it means plug is firing. Keep engine running and pull inductive clamp off #1 spark plug and clamp it around next plug cable. Keep repeating procedure for all eight plugs. If the timing light does not flash for one of the cylinders, record which one(s) on a notepad. Watch timing light (with trigger pulled) to see if light flashes are evenly spaced. If any have intermittent lapses, record it on the notepad. When finished, pull the cables off the plugs where there were no light flashes and test them against the engine block to see if spark appears between end of cable and block. (use an appropriately sized spring placed into the spark plug boot to protrude from the end of the rubber to do this test). If the cable produces a spark, plug may be bad or fouled. Remove and replace spark plug. |
|
10-12-2020, 08:14 AM | #17 |
Senior Member
Join Date: Jul 2018
Location: Ottawa, Ont Canada
Posts: 161
|
Re: vibration
put timing light on 8 wires all good
took fan belt off no change engine and trans mounts seem nice and rubbery with crowbar exhaust is not touching any where damper seems nice but timing marks line up at 20-25 btdc is wr car runs best with its 59 distributor with mechanical advance (vacuum plugged) one thing i did notice is in intake manifold inside one of overies a piece of metal is hanging down the size of a potato chip Last edited by cvicky; 10-12-2020 at 08:23 AM. |
10-12-2020, 08:26 AM | #18 |
Senior Member
Join Date: Jul 2018
Location: Ottawa, Ont Canada
Posts: 161
|
Re: vibration
top right hole the black is a piece of metal flaking off the size of a potato chip
|
10-12-2020, 11:00 AM | #19 | ||
Senior Member
Join Date: Aug 2012
Location: IN A 'GALAXIE' FAR FAR AWAY
Posts: 6,416
|
Re: vibration
Quote:
Quote:
Can you pull it out? ... hmm ... Did you say replaced timing chain? A vacuum gauge would cut down on the diagnostics quickly.
__________________
***** - DISCLAIMER -
The above posted information is in my opinion only (IMO) and may contain copy and paste material(s). In addition, any above tech information is supplied in good faith. No responsibility implied or otherwise can be accepted for the way others use or interpret provided data. Your experience(s), opinion(s) and mileage may vary. DIAGNOSED CDO - (OCD In Correct Alphabetical Order) |
||
10-12-2020, 03:23 PM | #20 |
Senior Member
Join Date: Jul 2018
Location: Ottawa, Ont Canada
Posts: 161
|
Re: vibration
no i cant break flake off
|
Thread Tools | |
Display Modes | |
|
|
Sponsored Links (Register now to hide all advertisements) |
|