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8-105 Engine Tick Under Load Only

  • mikespeed35
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21 Dec 2017 05:24 - 21 Dec 2017 05:26 #33892 by mikespeed35
Replied by mikespeed35 on topic 8-105 Engine Tick Under Load Only
I think you are missing the oil drain back tube on the rear main.
The bearings are .020 undersized and were made in 8/06.
CORDiallyMike
CORDiallyMike

Mike Huffman
Last edit: 21 Dec 2017 05:26 by mikespeed35.

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  • curtiss
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21 Dec 2017 04:04 - 21 Dec 2017 04:06 #33889 by curtiss
Replied by curtiss on topic 8-105 Engine Tick Under Load Only
Well I dropped the oil pan tonight and removed the rod cap on number 8 which is the cylinder I had scoring in and sure enough the second ring from the top was broken.

I looked at the Rod bearing and as I was told by a previous owner the rod bearings have been converted to inserts but they were in pretty bad shape as was the crank. I was at least able to get number off of the bearings so I can get them replaced.

Now I have to lean how to decode bearing numbers :)



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Last edit: 21 Dec 2017 04:06 by curtiss.

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13 Dec 2017 04:05 - 13 Dec 2017 04:51 #33860 by curtiss
Replied by curtiss on topic 8-105 Engine Tick Under Load Only
I just got the head off and it is looking like I have a pretty solid scoring in the rear cylinder and the top of the back 2 pistons had a thin coat of oil on them. I also noticed an inconsistent color in many of the valves by cylinder. I am done for tonight :(


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13 Dec 2017 03:37 #33859 by Ivor
Replied by Ivor on topic 8-105 Engine Tick Under Load Only
Hello Curtiss, the part Randy is referring to is in the attached photo, the cam followers run on the camshaft and lift the valves, As Randy stated the cast mushroom shaped heads of the followers come loose in the stems sometimes, I found three loose on my build. The followers are in the follower block, there are four of these.
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13 Dec 2017 03:00 #33858 by curtiss
Replied by curtiss on topic 8-105 Engine Tick Under Load Only
Randy, this may sound dumb but what are the cam followers? I am looking at the parts manual and do not see a part labeled cam follower.

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  • RandyEma
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13 Dec 2017 01:02 #33856 by RandyEma
Replied by RandyEma on topic 8-105 Engine Tick Under Load Only
Hello. Also look at the cam followers as the cast heads do come loose from the stems. R

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  • 1748 S
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13 Dec 2017 00:33 #33855 by 1748 S
Replied by 1748 S on topic 8-105 Engine Tick Under Load Only
If and when you pull the head to "check" the exhaust valve springs and guidea might be a good time to remove the oil pan and pull the pistons and rods. Look for a cracked piston. Your in for a dime and going the extra is a cost effective way to remove doubt.

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12 Dec 2017 20:40 #33854 by curtiss
Replied by curtiss on topic 8-105 Engine Tick Under Load Only
Thank you for the advise, I will do that!

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12 Dec 2017 20:35 #33853 by Ivor
Replied by Ivor on topic 8-105 Engine Tick Under Load Only
Hello Curtiss, It is very easy for the valve stem collet's to fall into the sump when removing the valves, to prevent this fill the area around the cam follower blocks with rag or cushion foam. Don't forget to remove it after the work .

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12 Dec 2017 04:59 #33852 by mikespeed35
Replied by mikespeed35 on topic 8-105 Engine Tick Under Load Only
I use the reg. "C" type valve spring compressor used on overhead valve heads. The lifter should be adjusted to give the most clearance to get the spring out once released. I use a screwdriver to bend and pry the spring put. I would avoid running the engine at 2000 to 2500 under no load for two to five minutes though. You may hear more than ticking!
CORDiallyMike

Mike Huffman

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12 Dec 2017 00:39 #33851 by curtiss
Replied by curtiss on topic 8-105 Engine Tick Under Load Only
OK, I know this is an old one but still working on the fix :)

I have tried many things and the problem is now more easily repeatable but still there. I adjusted the lash, changed oil, ran some marvel in it, checked for a broker valve spring and still there.

I can now recreate the symptom by warming the engine a little than while sitting still rev it to 2000 or 2500 for about 2 to 5 mins then it will start ticking and it will have a miss but as soon as I let off the gas it normally goes back to a normal running engine.

At this point I am suspecting it is an exhaust valve since it is not backfiring or spitting from the carb side. I am thinking one or more of my valve guides is too tight and when the valve heats up it is expanding and sticking. I am to the point that I am going to pull the head and the valves out to see if I have a tight guide. I may go ahead and get a guide reamer and run it through each one.

My question is around tools, what valve spring compressor will work on the flat heads and is there anything I should be aware of tackling this?

Thanks,
Curt

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25 Aug 2017 03:29 #33469 by mikespeed35
Replied by mikespeed35 on topic 8-105 Engine Tick Under Load Only
Yes, and ground the valves while I was at it. If it continuously clicks do a compression check and see what you find. Not guaranteeing its a valve though.
CORDiallyMike

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24 Aug 2017 17:32 #33468 by curtiss
Replied by curtiss on topic 8-105 Engine Tick Under Load Only
Thanks Mike, what did you do to clean them. Pull the head and remove the valves?

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24 Aug 2017 05:00 #33464 by mikespeed35
Replied by mikespeed35 on topic 8-105 Engine Tick Under Load Only
I had a intake valve stick and it did not backfire and lost some power. It would come unstuck and not stick again for several hundred miles. It would only tick for 10 or 20 seconds and then stop. It tried all kinds of special elixirs but only cleaning the guides and valve stems fixed it.
CORDiallyMike

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  • RandyEma
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24 Aug 2017 03:43 #33463 by RandyEma
Replied by RandyEma on topic 8-105 Engine Tick Under Load Only
Hello. I have run into cam followers coming loose from there stems and loose pistons rattling both have a different sound . Randy

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  • Curt Schulze
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23 Aug 2017 11:31 #33458 by Curt Schulze
Replied by Curt Schulze on topic 8-105 Engine Tick Under Load Only
I would post this question out on the AACA website under technical.

The bitterness of poor quality remains long after the sweetness of low price is forgotten.
Be of Good Cheer
Curt

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23 Aug 2017 01:48 - 23 Aug 2017 01:50 #33455 by curtiss
8-105 Engine Tick Under Load Only was created by curtiss
OK, here is a mystery noise I need help figuring out. I have a 8-105 and it seems to run great ad idle and low speed flat service driving.

My issue is when I am in 2nd going up a 1 block long hill or driving in 3rd going over 40 MPH for a mile or so I will hear a tick in the engine and it seems to loose a little power, not much though. As soon as I get back on level ground and let off the gas (no load) in about 20 to 30 seconds the tick goes away and I can continue driving on level surfaces or at low speeds with no issue. During the event it has good oil pressure and is running at about 170 degrees.

I just changed the oil and put in fresh 40 weight oil with 1 quart of Marvel to see if that helps. I have only run it for about 10 mins with the new oil and marvel in it.

I am thinking an exhaust valve might be sticking because if it were an intake I would think it might backfire through the carb and it does not.

I may strap my gopro under the hood to try to get a recording of the noise.
Last edit: 23 Aug 2017 01:50 by curtiss.

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