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What Is The Harley Davidson Automatic Compression Release - ACR

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RevelatorAlf

RevelatorAlf

Күн бұрын

What Is The Harley Davidson Automatic Compression Release - ACR - Here I explain what is the ACR on a Harley Davidson M8 engine and what is its function and how it is controlled. I also explain what errors can be associated with it too and how faults can be fixed.
#RevelatorAlf #HarleyACR #HDSportGlide
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Пікірлер: 45
@RevelatorAlf
@RevelatorAlf 4 жыл бұрын
Thanks for watching. Have you had any issues with your ACRs on your motorcycle? More videos like this here: kzbin.info/aero/PLmgCmljtdCzWrLg62oZxo0laIsmq4j67P
@marktalkington1329
@marktalkington1329 Жыл бұрын
Thank you so much for this. My brand new Street Glide is in the shop after throwing the ACR codes after driving it home on Day 1. This is very helpful to understand what needs to be done.
@RevelatorAlf
@RevelatorAlf Жыл бұрын
Cheers
@chrisdagley2379
@chrisdagley2379 4 жыл бұрын
So glad I came across this video! I searched all over to try to find a detailed explanation for a P1655 code. This was very helpful!
@RevelatorAlf
@RevelatorAlf 4 жыл бұрын
Glad it helped! Cheers
@miguelestrada6435
@miguelestrada6435 4 жыл бұрын
As always a very informative video. Thank you for sharing your knowledge. It is much appreciated
@RevelatorAlf
@RevelatorAlf 4 жыл бұрын
Thanks so much Miguel. Glad the videos are helping. Cheers
@aeronautic1
@aeronautic1 3 жыл бұрын
I went to HD in South Florida and ask them to check if I had a ACR on my Screaming Eagle 110. They did compression check, normal. Then they started fishing. A 1 hour check turned into a 3 hour fishing trip. The last thing I will do in the future is take my Harley to a HD dealer.
@RevelatorAlf
@RevelatorAlf 3 жыл бұрын
Yep it’s not right
@jackietang2976
@jackietang2976 4 ай бұрын
Thanks for the info
@bigross0318
@bigross0318 Жыл бұрын
Mannnnnn having that 550 cam my acr MUST WORK TO START haha. Thank you for the info!
@barryleimkuehler9531
@barryleimkuehler9531 Жыл бұрын
Just had that problem happen. Was ridding, came to stop, and then a "popping" sound from back cyclinder. Not like an exhaust misfire, more like back in old days when a sparkplug would pop out. This happened, stripped the threads. Extended warranty will pay for head, cylinder and the ARCV. Just my $50 deductaible
@m3talc0re
@m3talc0re 3 ай бұрын
Do you know if it will always throw the code? I’ve been having some very sluggish starting, I’ve changed the battery and the spark plugs with no change.
@daviesdeeman216
@daviesdeeman216 Жыл бұрын
Perfect and thanks
@RevelatorAlf
@RevelatorAlf Жыл бұрын
Cheers
@stanwerner7484
@stanwerner7484 7 ай бұрын
just wondering if you ever ran into a situation like this-- I hooked up my twin scan 4 unit (to bleed the ABS unit) on my 2029 SG, I throw the P1655 code ( I did replace both ACR, b/c I was up in the top end) the Twin scan would not clear the code after I checked the most likely issues---BUT I was about to clear the code by using my Power vision tuner PV 2. I reinstalled the twin scan and the same code appeared P1655--again not able to clear the code with the twin scan unit, BUT again, I was able to clear the code with my Power vision tuner ---strange? thanks in advance
@qthebikeahaulic
@qthebikeahaulic 2 жыл бұрын
It can also come flying out of the head and wreck your yearly vacation/holiday in Sturgis. 2018 Electra Glide Ultra Classic, still under extended warranty with 48k miles on it. I was in Sturgis a week before the rally, planning on staying for 3 weeks. On day 3 in Rapid City at 45mph in heavy traffic it blew out of the head. No HD Dealer within 100 miles would look at it because of the rally/ no warranty work only tires/brakes/oil changes. Had to tow it to U-Haul $117 usd, then haul it 1100 miles, $2100 usd plus $430 in gas home to my local shop. Also had a no refund cabin at Shade Valley Campground $1400 plus $285 wristband for 15 days. Just got off the phone with them-2 week wait for parts. Maybe next year I can get a vacation.
@RevelatorAlf
@RevelatorAlf 2 жыл бұрын
Oh crikey what a time you’ve had
@stanwerner7484
@stanwerner7484 2 жыл бұрын
Thank you for sharing--Question: would you happen to know the socket size to remove/install the ACR on a 2019 CVO Street Glide?---thank you
@RevelatorAlf
@RevelatorAlf 2 жыл бұрын
I think from memory it's a 13/16 but I can't be sure. I'll see if I can dig one out
@stanwerner7484
@stanwerner7484 2 жыл бұрын
@@RevelatorAlf Thank you, I appreicate the info--
@johnlewis5774
@johnlewis5774 Жыл бұрын
If it's faulty and stuck in the open position will it effect the way the bike runs?
@RevelatorAlf
@RevelatorAlf Жыл бұрын
Starting will be fine but you will hear a loud noise when twisting on the throttle
@beans4491
@beans4491 4 жыл бұрын
Nice one Mr RA, I’ll have a look to see if I can spot the ACR. What you doing in an aircraft hanger? Kind regards Beans.
@RevelatorAlf
@RevelatorAlf 4 жыл бұрын
Beans thanks fella. Ah well just hanging out! Sorry couldn’t resist ha ha
@RevelatorAlf
@RevelatorAlf 3 жыл бұрын
Ah great stuff. A&P? What did you work on?
@stephenfleming7056
@stephenfleming7056 4 жыл бұрын
I think if your engine is overheating the bike cuts fuel to the rear cylinder and it becomes a air pump, It may be that the ACR also operates I don't know.
@RevelatorAlf
@RevelatorAlf 4 жыл бұрын
Yep the EITMS works by cutting fuel but the ACRs are purely for starting relief cheers
@bhill221
@bhill221 3 жыл бұрын
My ACR unscrewed itself! I can’t figure out how to get a socket around all the wiring to screw up back in. PLEASE HELP!!!
@RevelatorAlf
@RevelatorAlf 3 жыл бұрын
Yes you need an ACR socket for that. Here is the part number: HD-48498-B-1. You may also be able to fashion you own ACR socket by cutting away at an old long socket but it might be too weak to tighten the ACR properly. Cheers
@stanwerner7484
@stanwerner7484 2 жыл бұрын
@@RevelatorAlf would you know the size of the socket needed?
@RevelatorAlf
@RevelatorAlf 2 жыл бұрын
@@stanwerner7484 Yes I believe it is a 13/16 for all M8s but not 100%. You could also try a 21mm or 22mm deep oxygen sensor socket at a fraction of the price but I haven't actually tried it myself but I can come back to you
@SnifftyDugan
@SnifftyDugan 2 жыл бұрын
MIne also came loose, shop wants to replace it because they had one break and blow a motor when they retightened it and the person rode it. BACK ORDERED!!!!!
@viktordubec5300
@viktordubec5300 Жыл бұрын
great video! I have Breakout Pro Street CVO Screaming Eagle 2017 (or 2016?), 16 000 km, and I have serious problems to start the engin at temperatures under 15 degree Celsius. With my technician we changed the battery 2 times, currently I have there LiFePO4 with 400A starting current. Still the same. We changed the starter for a new one with 1500W power. Did not help. My technician says that the diagnostic does not show any error. Could it be that there is some problem with the ACR? After the engine gets warm, I can start it normally . But at e.g. 12 degree Celsius it is impossible to start the bike. The starter is not able to turn the engine. And the voltage on the battery drops for a while under 8V and resets the display. Thank you for any hint.
@RevelatorAlf
@RevelatorAlf Жыл бұрын
Ok this is a puzzle. If you have changed both battery and starter motor, then unless they are defective as well then it could be just poor connections too. Test all wiring from battery to starter as well as negative earth too. As for the ACRs yes this is always a possibility but you would get an error code. But if your battery is not even turning the starter then I would say it is still a bad battery or connectors. Sometimes it’s the most simple things that get overlooked. Good luck
@bryantruebrogdon9396
@bryantruebrogdon9396 2 жыл бұрын
How do I get them out
@RevelatorAlf
@RevelatorAlf 2 жыл бұрын
Cheers fella
@garyruttledge3921
@garyruttledge3921 3 жыл бұрын
I have a 2019 Sport Glide with 3000kms on the clock, front a rear ACR solenoids changed twice by Harley Durban as they keep failing. Solenoids melted which suggests they failed open after starting. ACR's replaced, Ignition coil changed as they thought was intermittent voltage. 600kms later the same issue. I am trying to get them to change the BCM but they say this either works or doesn't. They ran various diagnostics after the second failure, cleared all the fault codes and yet still happening. Any help would be appreciated. It is still under warranty and being repaired by Harley but being stranded on the side of the road is not fun. How would these ACR.s fail in the open position or maybe don't close all the way when the engine starts
@RevelatorAlf
@RevelatorAlf 3 жыл бұрын
Ok for me this is not an ACR issue but rather look at the BCM & ECM as there is most likely a glitch there. I assume they’ve checked the wiring too for any shorts?
@RevelatorAlf
@RevelatorAlf 3 жыл бұрын
This will be a deep dive diagnostics to see what the issue is. My best guess this is an ecm issue working with the other sensors in the bike and giving false signals to the ACRs. Let us know what the final solution is. Cheers
@garyruttledge3921
@garyruttledge3921 3 жыл бұрын
@@RevelatorAlf Will keep you posted. I agree, based on your initial video, once the engine has started, the ACR should be closed and remain Closed. If the ECM is sending a false signal and it opens then it would explain why. The ACR,s were totally melted which was caused by being open or partially open and the hot exhaust gassed drawn in when the pistons move down. Wiring has been checked or so they say, in the first instance it blew a fuse, does that sound like an ECM. To me that's a short but then it doesn't explain why it has happened again, no blown fuse this time. Grrrrrr
@RevelatorAlf
@RevelatorAlf 3 жыл бұрын
@@garyruttledge3921 yep there’s more to this than they’re finding right now I’d say
@chopperjohn1046
@chopperjohn1046 4 жыл бұрын
My ACR's won't activate when the engine is hot..
@RevelatorAlf
@RevelatorAlf 4 жыл бұрын
are you getting you getting error codes? How do you know they are not working when engine is hot? What symptoms do you have for you to think that?
@stanwerner7484
@stanwerner7484 7 ай бұрын
sorry, that's a 2019 SG
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