TR6 tr6 engine tick

[tr3&tr6]

Hello everyone,

I have a '76 TR6, 43k miles. It has an engine tick.

I replaced the head with a remanufactured one that I had for another car, which didn't solve anything. At that time, I also replaced all the lifters.

Then, I decided the tick was coming from the bottom end, so I replaced the main bearings, thrust washers, and connecting rod bearings, all of which appeared to be in very good shape when I got in to them. It is still ticking.

Seems to be most noticeable after warmup, and is somewhat intermittant. I tried to isolate by disconnecting spark plug wires from all six cylinders one at a time and it doesn't change.

Otherwise the car runs great, with no missing or smoke.

Any ideas?

Thanks

 

[Guest]

Worn cam lobe ? or incorrect valve train geometry.

 

[vagt6]

Valve clicks might also be bent push rod(s).

Take the valve cover off and listed closely, that might help identify where it's coming from.

My 2 cents' worth, hope it helps!

 

[Carmine]

Can you be a little more descriptive in describing the sound. Does it sound like an exhaust tick? Does it sould like an electrical tick?(Distributor cap arcing?). Or does it sound like a metal to metal tapping? If metal to metal, you might be able to isolate using a stethoscope.
Can the sound be heard at idle as well as at speed? Does it happen just under load? Keep us posted.
Carmine

 

[tr3&tr6]

Definitely metal on metal.

I got impatient and went into the engine this week. A couple of the cam lobes are slightly worn/pitted with a noticable ridge on the leading side of the lobe.

Another lobe is SEVERELY worn to the point that the lobe is maybe 1/2 the height of the others. Maybe even a manufacturing defect?

Journals looked remarkably good considering the lobe conditions. Stamped Stanpart so I'm assuming it's the original.

Thanks for the feedback.

 

[MDCanaday]

My guess is that you ruined the cam with crummy lifters. If you have a set of originals they can be re-faced, and are better than what is to be had off the shelf these days. For a good re-grind check with Steve at Integral cams.
Good luck!
MD(mad dog)

 

[Rick O.]

A cam stamped "Stanpart" doesn't necessarily mean it is the factory stock cam. Most, if not all, cam grinders use the stock cam to build up and re-profile the lobes. Yes, your situation is no doubt due to faulty lifters which have circulated in the market several years ago.

Last month I replaced my cam after noticing very little lift on valve #11. Sure enough, that lobe was completely wiped down to the base circle. I have since installed the Isky 'Z-19' mild road cam with new hardened lifters supplied by APT. Beware of any lifters costing less than $10. apiece.

Good luck.

Rick O.
72 TR6

 

[Bugeye58]

I wiped out a lobe on a brand new cam on the 1500 Spit I was racing, due to a soft lifter. Dema Elgin, at Elgin Cams was able to repair the cam, and I sent him every lifter I had to be reconditioned. Not a problem since.
Jeff

 

[Hotdoc]

Lot of work ?lot of money. Works OK.Why worry?
hotdoc

 

[Steven]

I agree with HotDoc....when i had my motor rebuilt it had a ticking sound...I took it back and complained and they told me that it was normal...The ticking should go away pretty much when the engine has been run for awhile and is warm. Mine does. Anyway.....like HotDoc says...enjoy your car..if its works, don't fix it.

 

[kirschjf]

I had the same problem with an other car ( Lancia Fulvia ). I checked 20 times the valves set and it was ok. Finaly, I check the surface of each valve. The result was that to valve was deform. The surfce between the rocker and the valve was not flat but curve. The result on that is that when you check the valve with the gages you don't ckeck the real distance. The solution was to change the valve damaged. Now the engine is running perfectly. Good luck.
JF Kirsch

 

[mailbox]

Have any of yall ever seen the old Fram oil commericals where the mechanic says " You can pay me a little now or pay me a lot later "? You can fix a small tick now or fix a big knock later. Just a thought.

 

[Dave Russell]

<blockquote><font size="1" face="Verdana, Arial">quote:</font><hr>Originally posted by tr3&tr6:

I got impatient and went into the engine this week. A couple of the cam lobes are slightly worn/pitted with a noticable ridge on the leading side of the lobe.

Another lobe is SEVERELY worn to the point that the lobe is maybe 1/2 the height of the others. Maybe even a manufacturing defect?
<hr></blockquote>
Hey guys,
He already said that the cam was shot in his second post. It's a little more than a "small tick"
D