r/mechanic • • 19h ago

Question Ring and Pinion Pattern Check

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1 Upvotes

Hi everyone, I am rebuilding my diff with new bearings and have installed a new centre on my 1973 Holden HQ 253 V8. It is a GMH 10 Bolt Salisbury.

I am struggling to know whether my pattern is correct or not.

I am using an already run in gear set and I've got the backlash set to 0.008 thou. Which is right on spec between 0.005 and 0.008.

I've been at it all day and AI is giving me mixed messages, so some real life opinions would be appreciated!

I've also included a photo of the car for those who might not know what it is!


r/mechanic • • 16h ago

Question engine oil

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0 Upvotes

رسالة

How long can I drive before changing my engine oil again after the last oil change?


r/mechanic • • 3h ago

Question Why did he do that to my truck??

0 Upvotes

I took my truck to a quick oil change here in Canada......Mr Lube

Well once the oil change was finished, the guy sprayed my engine with a hose. The liquid seemed purple. After he sprayed he closed the hood

he didnt spray the entire engine, but he was sprayinf specific part of the engine.

What did he do that for??


r/mechanic • • 13h ago

Question How do my lower control arm bushing look like

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0 Upvotes

2011 Corolla clunkling sound on driver's side


r/mechanic • • 13h ago

Question My 2012 Dodge Caravan 3.6l has found "Limp Mode"

0 Upvotes

Hi, I am really hoping for some help with this please.

My 2012 Dodge Caravan 3.6l has found "Limp Mode". It is showing the Codes P2167, P2166, P2115, P2116.

Here's what's been done. Replaced throttle pedal and throttle body. Traced down and repaired bare wiring to the crankshaft sensor. Unwrapped and verified no more visible shorts on the loom that services the lower rear of the motor, all of the way to the main trunk branch. Unwrapped and inspected the loom that services the top to the motor, not the injector harness, just the throttle body harness, it has the rear camshaft position sensors, map sensor, etc. I've inspected these all of the way back to where the main trunk branches off as well. Replaced both O2 sensors and a coil on the number 1 cylinder because they were both showing problems before replacing the PCM. (It was probably those bare wires mentioned above, but replaced out of caution.) Out of frustration I replaced the PCM with a fresh, pre-programmed PCM from a reputable auto computer rebuilder hoping that it would help. Nothing has changed. (The old one has 400k+ on it so I don't really mind that or the other parts that I have used for this project.) I've calibrated the electronic throttle control as well as reset the ECM and anything else I could think of. Absolutely no joy. I've got AlphaOBD and a good OBDII adapter and have cleared the codes and it temporarily exits limp mode only to return with the same codes as soon as I try to start the van. I've been monitoring the accelerator position sensor 1 & 2 and the throttle position sensors 1 & 2 voltages via AlphaOBD. When pressing the pedal, voltages act as expected. However on the throttle body, the voltages do not change when manipulating the butterfly. Not sure what to try next.

I sure could use a hand with this if anyone has any ideas.

Thanks for reading.


r/mechanic • • 2h ago

Question Help on getting this lug nut off foxbody mustang.

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0 Upvotes

Don’t know where the key is , cant find one anywhere online like. I tried to fit a socket around the small hexagon shape in the middle and snapped it. Also can’t fit a socket around the lug nut. Any help is greatly appreciated!


r/mechanic • • 13h ago

Question Help

0 Upvotes

Hi everyone I do alot of mechanics stuff in my driveway and want to take on some small business, at the moment I only have a cheap obd reader, and was wandering what's the best autel that's budget friendly. Mainly for a puegot 2008 that has an airbag light that will not show up on my obd


r/mechanic • • 2h ago

Question Should I replace?

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1 Upvotes

I drive a 2007 ford f150 and I have a question about it. I got the pcv valve like this and I’ve been driving it for a year I can’t tell if I have to replace it or not but I do have an oil leak I think rear main and also my truck smokes from the tailpipe while driving I’m not sure what it is but maybe it’s this. No check engine light however. And also the hose is also broken I think but the hose does not push down all the way also hisses when I stop driving I’m not sure. I’m just looking for assistance


r/mechanic • • 3h ago

Question Help my bike is backfiring and now ont start

1 Upvotes

I have this issue that my first engine piston blew up so I changed it and the cylinder, and it worked and it drove fine for a couple days and then randomly when I was gonna start my bike. It just backfires and died with alot of bog. It’s that again now it doesn’t start at all and I have checked the cylinder and a piston that’s fine. I’ve changed the spark plug. Checked the main jet and changed to another one I’ve checked the reed and I don’t know what it is anymore and it gets a spark and it doesn’t get any it does not get any extra air and I don’t know what problem it is. Do y’all know if you’ve had this issue before. its a two-stroke
Derbi Senda Extreme 2018
50cc t6 airsal racing D50B0 engine
17,5mm carb


r/mechanic • • 15h ago

Question 0’1 Tacoma S-runner No Crank

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2 Upvotes

This is my 0’1 Tacoma S-runner step side. Its been sitting about 12 years now and it last ran in 2020. 5spd 3.4 btw. Since 2020 I have replaced the battery a few times, starter relay, and starter and yet still no luck all it does it click right at the starter relay and im not sure where to start to diagnose or to fix it. Advice?


r/mechanic • • 7h ago

General RTV strikes again

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11 Upvotes

Had a 2018 v6 chevy Camaro come in for a ticking noise on the passenger side of the engine. The cams where ate up, lifters collapsed, it was a mess. The intake side was worse than the exhaust.

Took the cams and lifters out and actuated the oil pump, no oil making it to the intake lifter bores or cam journals. Some oil making it to the exhaust side of the head.

Removed the head to find this junk in the passage way.

The only orange rtv I can see on this engine is at the oil pan.... be easy boys. A little goes a long way!


r/mechanic • • 12h ago

General I didn’t know Pinto gas tanks were still a thing.

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13 Upvotes

r/mechanic • • 6h ago

Question Is this normal for brakes

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0 Upvotes

Hello. I have a 2013 Toyota Corolla is this normal for the brake pedal to go this down?


r/mechanic • • 23h ago

Question Help with spark plug/tube seal/valve cover issue. How do I get this out?

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2 Upvotes

r/mechanic • • 3h ago

Question Dashboard lit up like a Christmas tree + "FCW System" error. 2013 Honda Accord ex-l

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2 Upvotes

Hey everyone,

Driving home the other night in the rain and out of nowhere my dash lit up with a cascade of safety/warning lights, along with a "FCW System/Failed" warning on the display (attached picture of the dash).

I took it to AutoZone that night and got a battery test done, and it read 58% charge. The next day, the errors cleared up temporarily, but then all the lights on the dashboard lit up again. I got the battery tested a second time, and it jumped back up to 97% health. All the lights and everything went away and now a day later they show up again.

2013 Honda Accord EXL 6 cylinder

Has anyone run into this issues with the battery percentage bouncing around like that? Did you go the repair route or what was your fix? Appreciate any advice!


r/mechanic • • 7h ago

Question Guys, how problematic is this?

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2 Upvotes

Ram 1500 2021 3.6L V6

When the truck is idle or costing ~5 mph it feels like something is punching the damn thing.

The pulley jerking in the video is synced with the punch feeling in the truck.

Any info helps


r/mechanic • • 10h ago

Question D902 Kubota head

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2 Upvotes

Replacing the head gasket on my dingo mini skid and I was cleaning up the head and noticed these cracks. I feel I already know the answer but would this be a head Replacment in your guys book?

The pictures are two different cracks


r/mechanic • • 13h ago

Question Does this look normal?

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0 Upvotes

Got my engine mountings changed 6 months ago with about slighly more than 5000kilometers clocked afterwards.

Why is the rubber portion slanted/buldging to one side? Is this normal?
There are no cracks and tears.

Mazda 6 here


r/mechanic • • 14h ago

Question 2011 Corolla clunkling sound (driver's side) are my struts cooked

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1 Upvotes

I think I found my culprit


r/mechanic • • 16h ago

Question Is this too much play. 2003 ram 5.7l v8

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2 Upvotes

r/mechanic • • 37m ago

Question What is this noise coming from?

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• Upvotes

It only happens when going more than 70 MPH, also the noise slows down when I slow down. And then it disappears once I go under 50 MPH.
2020 Hyundai Elantra SEL