Loud tappet tick on ACE 1100 suspect clogged oil passage? - Honda Shadow Forums : Shadow Motorcycle Forum
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post #1 of 19 (permalink) Old 09-05-2016, 08:15 PM Thread Starter
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Loud tappet tick on ACE 1100 suspect clogged oil passage?

My 1997 ACE 1100 has developed a loud tappet noise on the rear right cylinder. I know it is rear right as I listened with a stethoscope. Putting in fresh 10W40 dino oil and a bit of ZDDP Rislone additive did not change the noise. I now suspect a clogged oil passage, as my dipstick was missing its small o-ring a season ago, so maybe it's fragments are blocking it. Maybe not.

How do I check for a clogged oil passage? Can I check the tappets for lubrication without removing the engine? Any advice is most welcome.



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post #2 of 19 (permalink) Old 09-05-2016, 09:41 PM
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You don't think you have excessive valve clearance?

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post #3 of 19 (permalink) Old 09-05-2016, 10:59 PM Thread Starter
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Quote:
Originally Posted by hondaron View Post
You don't think you have excessive valve clearance?
How do you check for excessive valve clearance on a hydraulic tappet?


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post #4 of 19 (permalink) Old 09-06-2016, 12:12 AM
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Does the sound get louder when revved up a bit or go away with more RPM? My old '83 750 has an idle clatter I keep thinking is a collapsed lifter But it gets quieter at about 2000 RPM. It runs OK at this point so I am not willing to tear it apart. I also found the rear cylinder cam chain tensioner is weak and may allow some chain slop at low speeds. No way to see what the lifter is doing without taking it apart.
A piece of O ring would have to be pretty small to pass though the oil pump pickup screen.

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post #5 of 19 (permalink) Old 09-06-2016, 11:17 PM Thread Starter
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Originally Posted by swifty2014 View Post
Does the sound get louder when revved up a bit or go away with more RPM? My old '83 750 has an idle clatter I keep thinking is a collapsed lifter But it gets quieter at about 2000 RPM. It runs OK at this point so I am not willing to tear it apart. I also found the rear cylinder cam chain tensioner is weak and may allow some chain slop at low speeds. No way to see what the lifter is doing without taking it apart.
A piece of O ring would have to be pretty small to pass though the oil pump pickup screen.
Hey Swifty, no the sound is constant in volume; I don't hear it at 80 MPH because of wind and engine noise, but the tap is still there. Obviously the frequency of the tap increases with engine speed. It is noticeable enough at idle that people on the sidewalk can hear it. At first the tap would occur only when the engine was run for maybe a half hour, now it happens whenever it is running.

Do you think a can of seafoam would help or hinder? I see in other threads that guys have tried different oils with varying results. I just want to avoid any damage as the constant click click click click click sounds like it is going to wear something out if not already.


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post #6 of 19 (permalink) Old 09-06-2016, 11:24 PM
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Well I've heard of using seafoam right before oil change but I would not let it in there very long. Maybe a few miles and then change. Don't know that it will fix your problem tho. I use seafoam in the gas but probably won't do it in the oil unless im having issues.

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post #7 of 19 (permalink) Old 09-06-2016, 11:35 PM
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With our wet clutch system any oil additive could reduce the friction of the clutch. I had thought of the same thing but decided not to chance a slipping clutch. Seafoam would be best for the carb.
As an experiment when I had read about the cam tensioner being weak on some of the early 750 models I took out the spark plug sleeve that screws in to one side of the head. With it out I could get my finger in and actually touch and move the chain on it's guide. The rear one is loose and the front one is tight so the spring mechanism is weak on the rear chain. Not sure if yours is the same but it is something to investigate for a check list of possibilities.
I have been using Rotella T 15-40. That may be worth a try.

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1983 750 Shadow
From the past=
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1962 Honda 305 Dream
1965 Honda 305 Dream
1971 Honda 175 scrambler
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post #8 of 19 (permalink) Old 09-07-2016, 12:20 AM
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A old street racer trick was to use 20% tranny fluid to keep hydraulic lifters clean and quiet. Done it for 8 yrs. on my 71' 307 Chevy Nova. Sold it with 175,000 mi. with out any issues.




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Last edited by h13man; 09-07-2016 at 11:07 AM.
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post #9 of 19 (permalink) Old 09-07-2016, 01:16 AM Thread Starter
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Is the cam chain tensioner hard to access? What tool to remove the spark plug sleeve on the cam side?

Following the Honda maintenance manual:
1- check low oil. Nope, up to the fill line.
2- check oil pressure. Appears okay but I need to see if it is 64psi at 5,000rpm and 80 degrees C
3- Remove cylinder head cover and oil hole caps, check lube.

I don't know where the oil hole caps are located, can't find it mentioned anywhere in section 8 "Head/Valve" of the manual.
Hmmm, maybe I will try some Rislone top oil next, thinking it might be an oil issue.


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post #10 of 19 (permalink) Old 09-07-2016, 12:44 PM
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That would probably be a good test to see the oil pressure first. Mine was very good, but that is the measurement at the oil pressure switch hole down next to the water pump. Not real easy to get to it.

As far as the spark plug tubes mine are 27 MM so I found an old crankshaft pulley bolt. But some guys use a 1 1/4 pipe and grind flats in it and drill a hole at the upper end to put a screwdriver through.

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Only a biker knows why a dog sticks his head out of a car window.
1983 750 Shadow
From the past=
1951 Cushman scooter
1962 Honda 305 Dream
1965 Honda 305 Dream
1971 Honda 175 scrambler
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