Engine knock


Information and questions on GL1500 Goldwings (1988-2000)
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Mattsezz
Posts: 4
Joined: Mon Mar 22, 2021 12:20 am
Location: Adrian Michigan
Motorcycle: 1989 GL1500 goldwing

Engine knock

Post by Mattsezz »



New to the site.....hope maybe someone can help.
My GL1500 has developed a knock. Now being a mechanic, my #1 cause was.....i have a rod getting ready to leave the building.
Second guess, piston slap....wrist pin is fed up and going on strike.
I know what a rod knock sounds like.......and this sounds 100% like a rod knock.
Only at a steady speed, and once warmed up.
heres my issue........that " rod knock " started 4200 miles ago.......and has gotten NO worse. Free way trips from Mi to Tn and back......no change. I know enough to know a rod going south dosnt get better......or just stay the same.........the worse it gets the faster it gets worse.
I have checked for exhaust leaks at the head.....and i have deleted the air shot system. Even bike mechanics scratch their heads, short of taking the engine apart.
Clutch in makes no diff, so its not the basket. I dont think alt dampers would sound like a rod........i dont think....
No knock at idle or revving the engine at a stop.
ANY input would help......i think i need someone to think out of the box, im dwelling on it to much.
Thanks for reading !!!


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AZgl1800
Posts: 2825
Joined: Thu Oct 30, 2008 2:46 pm
Location: Lake Oologah Indian Territory USA
Motorcycle: 2009 Piaggio MP3 250cc https://imgur.com/foGDjgv

'02 GL1800 lives in Dawsonville, GA now.
My son is going to enjoy it for many years to come.

Re: Engine knock

Post by AZgl1800 »

stuck lifter(s)

Goldwings just about never, develop and rod knock, unless driven without any oil in the crankcase.

I bought a '94SE that had been setting up in 110*F Arizona heat for 2 plus years,,, more like 5 if my guess on it was true....

the lifters on that thing knocked like crazy, I drained the oil and put in fresh oil, new filter, and SEA FOAM.

4 oz of Sea Foam to the Crankcase engine oil.... let that run for 100-200 miles, and all the lifters will work again, and the blackest sludge you ever saw will drain out next time.

1500s have Timing Belts, not Timing chains.
~John

2009 Piaggio MP3 250cc

https://i.imgur.com/4SOFPYS.jpg
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DenverWinger
Posts: 1969
Joined: Thu Jun 23, 2011 2:20 pm
Location: Denver, CO
Motorcycle: (s)
1980 GL1100 STD Vetter (2005-)
1993 GL1500 Aspencade (2017-)
1983 Trav-Lite Camper (2010-)
Past rides
1972 CL350 (1980-1988) sold
1978 Suzuki GS550 (1985-2005) sold
1977 GL1000 (2002-2006) sold

Re: Engine knock

Post by DenverWinger »

I initially bought my '80 1100 basket case in spring of 2005 as parts for my '77 GL1000, it had full Vetter set I wanted for the 1000. Disappointed to discover there were enough differences in the 1000 and 1100 frames that the Vetter mounts wouldn't work without serious adaptation.

So I gave up on that and started into seeing if I could make the 1100 with 45k Miles on the clock run again. First time I fired it up I noticed a knock which quickly went away when the oil pressure came up. "That sounds like rod bearing or wrist pin" I said to myself. If it's a rod bearing this engine won't last long, if it's a wrist pin could go on a long time. So I made it road-worthy enough to drive local and put some miles on it to assess the knocking.

The next summer after some 2000 miles the knock wasn't getting any worse so It couldn't be a rod bearing, I decided to keep the 1100 and sold the '77 1000. That was in 2006.

Today the 1100 is still in the garage, has 102,000 miles on it, has made four cross-country trips, two of them pulling the camper trailer. I bought the 1500 four years ago and removed the trailer hitch from the 1100, the 1500 now has trailer-pulling and cross-country duty.

The 1100 still knocks when you start it, and after the 57k miles I've put on it the knocking is clearly louder than when I first got the bike. In fact you can hear the knocking at certain RPM going down the road now. But I never expected to get that many miles out of a knocking wrist pin. I figure there's still 10k miles left in it, but now the 1100 is only for local/commuting. I'll keep driving it 'til it gives up.
♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪ :shock:

~Mark
Mattsezz
Posts: 4
Joined: Mon Mar 22, 2021 12:20 am
Location: Adrian Michigan
Motorcycle: 1989 GL1500 goldwing

Re: Engine knock

Post by Mattsezz »

I replaced the timing belts when I got the bike. so thats all good, however im worried that you say a wrist pin knock can last a long time......im good......but not split the block good. Heck i dont even think id replace the motor......id buy another used wing. Prob cheaper too
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ct1500
Posts: 1517
Joined: Wed Nov 10, 2010 8:09 pm
Location: Glastonbury,CT
Motorcycle: 1988 GL1500
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Re: Engine knock

Post by ct1500 »

Out of the box thinking would be crankshaft thrust bearing wear which allows crank to walk fore and aft and will make a knock. With access to the front crank bolt tap it rearward with a composite hammer and with dial indicator set-up on front bolt pry crank forward from behind timing gear. Read indicator movement and compare to specs. Can't remember if the average car motor was in ten-thousands or thousandths for play but will WAG it should not be more than .001-.003. ;)
Local and need repair help with your 1500, Valkyrie or ST please click contact
Nothing leaves my shop till its' perfect
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Mattsezz
Posts: 4
Joined: Mon Mar 22, 2021 12:20 am
Location: Adrian Michigan
Motorcycle: 1989 GL1500 goldwing

Re: Engine knock

Post by Mattsezz »

will excessive end play cause a pile of rods on the freeway?
again.....been there a long time with no ill effects or increase in noise, so im assuming slow crank wear correct?
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ct1500
Posts: 1517
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Location: Glastonbury,CT
Motorcycle: 1988 GL1500
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Re: Engine knock

Post by ct1500 »

Mattsezz wrote: Mon Mar 22, 2021 4:55 pm will excessive end play cause a pile of rods on the freeway?
again.....been there a long time with no ill effects or increase in noise, so im assuming slow crank wear correct?
No and yup on thrust bearing wear more than crank. Fairly simple set-up to check crank for thrust bearing wear. You wanted remote possibilities and I did my best to accommodate. :)
Local and need repair help with your 1500, Valkyrie or ST please click contact
Nothing leaves my shop till its' perfect
This is what I do
Mattsezz
Posts: 4
Joined: Mon Mar 22, 2021 12:20 am
Location: Adrian Michigan
Motorcycle: 1989 GL1500 goldwing

Re: Engine knock

Post by Mattsezz »

my fear........i have to much play......and that will require splitting the block and crank work.....all for a knock......fix it?.......drive till she pops?.....hmmmm


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