Rev counter signal

krede · August 31, 2014, 01:03:04 PM

If anybody has a suggestion as to the origin of the ticking sound coming from the engine (on the video) it would be much appreciated. We first thought it to be miss adjusted valve, but they appear to be fine.

Jon Weywadt · August 31, 2014, 06:15:04 PM

Quote from: krede on August 31, 2014, 01:03:04 PM
If anybody has a suggestion as to the origin of the ticking sound coming from the engine (on the video) it would be much appreciated. We first thought it to be miss adjusted valve, but they appear to be fine.

Do you have the original mexhanical fuel pump? That is a guess.
If you can get hold of a mechanics stethoscope you will be able to locate which part of the engine it comes from. Another possibility is to take a long screwdriver press the handle to one ear and the blade to different parts of the engine. It should be possible to find where it is loudest and thus where the problem lies.
Good luck..
/Jon

Oetker · August 31, 2014, 06:48:54 PM

Where is the video?

northmurena · August 31, 2014, 08:05:19 PM

@Hermann: That was/is on the first page. Had also to search for ;-)

https://www.youtube.com/watch?v=ctYrQGqC9bM

Oetker · September 01, 2014, 03:38:34 AM

Sounds like valve or distribution but difficult to tell from a distance.
Like Jon said,
Try this or a screwdriver to pinpoint.

http://www.ebay.co.uk/itm/Automotive-Mechanics-Stethoscope-Sensitive-probe-Car-Engine-Diagnostic-Tool-Van-/160956630459?pt=UK_Diagnostic_Tools_Equipment&hash=item2579c345bb

Herman

Jon Weywadt · September 01, 2014, 08:06:32 AM

Quote from: Oetker on September 01, 2014, 03:38:34 AM
Sounds like valve or distribution but difficult to tell from a distance.
Like Jon said,
Try this or a screwdriver to pinpoint.

http://www.ebay.co.uk/itm/Automotive-Mechanics-Stethoscope-Sensitive-probe-Car-Engine-Diagnostic-Tool-Van-/160956630459?pt=UK_Diagnostic_Tools_Equipment&hash=item2579c345bb

Herman

That is exactly the stethoscope I have.

It works great.

krede · September 01, 2014, 06:01:47 PM

Oetker: The gear for the distributor was severely worn, with some small chunks of the gears missing (Hans perhaps you can post a picture of the gears?) but I cant see how it could make such a noise.

Oetker · September 01, 2014, 06:26:13 PM

Yep.saw it before.

Expencive gear.

Edit,
The gear is to soft.
Especialy done to spare the camshaft in worst case scenario.

Herman

krede · September 01, 2014, 08:15:06 PM

That looks exactly like the one from the engine on Hans engine. Let's hope we have found the cause of the ticking sound then

Matra_Hans · September 01, 2014, 08:27:21 PM

my gear for distributor looks exactly The same (:-(

roy4matra · September 02, 2014, 03:28:25 AM

I have seen this before too. It was in an engine where a valve had been sticking and the piston had been hitting it. I suspect the damage to the gear was from the shock of the impacting.

So make sure all the valve guides are good and the valves nice and free.

Also make sure you have cleaned the engine out thoroughly to get rid of all the broken hardened bits from this damaged gear.

Roy

Oetker · September 02, 2014, 11:49:57 AM

Is it hardened?
I can easy file/rasp a bit of the tooths.
It's porous.

Herman

Matra_Hans · September 02, 2014, 04:35:12 PM

Hi all.
This is my distributor drive. It looks exactly like the picture posted by Herman. But I have to my knowledge not had any blocked valves or similar as mentioned by Roy.
Luckily I do not need the distributor as I have installed a trickerwheel

Thanks to all of you for your comments and assistance.
Hans

Oetker · September 02, 2014, 04:44:23 PM

The damaged one from my picture came from a good running S.
Also no Valve trouble.
Thats why I think it's the gear itself that's not up to the task or as they told me made that way to protect the camshaft gear.

Herman

roy4matra · September 05, 2014, 08:09:19 PM

Quote from: Oetker on September 02, 2014, 04:44:23 PM
The damaged one from my picture came from a good running S.
Also no Valve trouble.
Thats why I think it's the gear itself that's not up to the task or as they told me made that way to protect the camshaft gear.

Herman

I would be surprised if it was mild steel, as it simply would not last and any swarf from the wear could get in to the engine. So I suspect that even if it is softer than the camshaft gear to protect that and be sacrificial itself, I would still say it must be slightly harder than normal mild steel, and I would still want to clean out the complete engine to make sure there are no bits left in that could cause problems later.

Also if it were plain soft steel, then on the engine I worked on where the valve had been hitting the piston, I suspect the damage would have been different to what it was, but I can't say for certain.

If nothing was causing this damage on other engines, then why do some engines have the problem and others do not? Quality of oil maybe? Another reason to use the best full synthetic, as far as I'm concerned.

Roy