Ask Xulfiqar - An Automotive Encyclopedia

[capsat]

you need to check for the Brake boaster vaccum pipe / valve which may have a minor leak

[capsat]

changing brake pads & shoes is not a big deal. you only need proper tools a jack stand and presence of mind while installing new parts. Brake shoes in drum need some fine adjustment to engage when hand brake is engaged. Disc pad clipper need silicone lubricant spray to avoid squeaking noise later

[moizadil]

Would know of a place where I can get silicone grease? There a long thread on this topic by xulifiqar bhai but it doesn't say where you can get this grease. There's a wd 40 silicone spray but I haven't come across any place which sells silicone grease so info on that would be good.

And what's you take on aerosol brake cleaner? Are they useful?

[capsat]

adenwalla is source https://www.adenwalla.org/

[Xulfiqar]

if you notice - there is a captive nut on the other side of the caliper pin boss, you have to counterhold it when you loosen the pin bolt.

btw - you dont need to undo the caliper to see the brake pad, you can inspect it through the little window slot in the caliper or just from the outside looking at it,

[Marschall]

Sir what are tell tale signs of worn out piston rings on a m112? blue smoke? i some times get blue puff of smoke during startup

[Xulfiqar]

mercedes m112 have extreme long life cylinder packs, the rings are very light tensile strength too,

the blue smoke on startup is usually a sign of bad valve seals or bad valve guides, usually seals. remove the heads and fix it up.

[Marschall]

yes thats what i think,but no ustaad is capable of doing that without opening the complete head

[Marschall]

and tick tick noise from power pump ustaad saying "Nawa pump pana paisi"

[Xulfiqar]

removing and reinstalling the heads is not too bad, all you need is the timing tool set.If I were you, I would pull out the powertrain (engine and gearbox) - remove heads, redo them, install new timing chain and slipper rails, replace the rear main too (as it fails too with age) and reinstall it back.

Its very easy to work on with the engine on a stand. working inframe is difficult on your chassis and replacing the timing chain is very very difficult. The problem is that the timing case upper portion is part of the head casting now as compared to the older engines like m102, 103 etc.

[Xulfiqar]

replace the little black container on the pump, it has a filter built into it and is probably clogged. Dont try to tear it as the filter acts like a damper for oil flow. if its not damped the pump will whine.

When replacing the tank, make sure the square/lathe cut O ring is not squashed or pinched while pushing the tank on. (use vaseline not grease to install)

[Marschall]

Thats the issue they did the whole engine ,timing chain rails are not available new and putting it back was another issue took whole day just to adjust the timing chain.I guess i will see if the smoke increases as it is just random on some starts , just a slight puff

[Marschall]

hmm thats good i will try that out

[z.u.m.a]

Please check your inbox.
Thanks,

[Xulfiqar]

the chain can be checked in place by removing both tappet covers and lining up the crank pulley mark, The chain tensioner on the M112 is bad if its original - new replacement part is cheap and better. - you will need to tap it slightly with a lead hammer after install to let the ratchet catch release and push the chain rail.

If you are confused at the original timing marks - then remember that it takes 14 rotations of the crank for the chain to line up the original copper coloured links to the cams again.

btw - chain rails are available brand new, and they are not too expensive either, the whole rail/chain slipper package is about 200 euros, the tensioner is about 50. - all you will need is the toolset..

but if its just a small puff and not much oil usage and the fuel trims are normal too - leave it alone. It will probably run for another 200K like that.

btw - its not more than 2 or 3 hours to remove the engine from your car.

[ajall]

Aoa. Sir.
My Honda civic reborn, 2007, RPMs fluctuate in the morning when I start the car, (between1.2 to 1.5). Like pendulum, up and down, again up and down. However after couple of minutes, RPMs become stable at 800. Please Guide me what to do. Regards.

[z.u.m.a]

The RPM initially will be higher untill engine reaches its operating temprature.It will decrease gradually from higher RPM to 800.
Its normal for all cars to have high RPM initially.

[ajall]

Sir. RPMs at initial start fluctuate like pendulum, up and down again up and down. Then after couple of minutes, become stable.

[Marschall]

The chain set wasnt available ,but yes i have had no loss of oil,SDS show no issue on fuel trim,consumption is great 11km/l with aircon in city.So i am planning to live with it,btw i need some technical pointers on how to check a m112 Kabuli engine on a halfcut ,ustaad says we will open valve covers and check the condition.Any way i can check the milage? and condition plus is there a diff b/w UK and Jap m112s,will i need a new EIS and everthing or is it just a bolt on

[moizadil]

@Xulfiqar bhai, is the brake travelling half way before engaging a bad thing? I mean it does engage before the half way mark but the affect is minimal and real braking happens after the halfway mark. I opened the rotors today and the brake pads were in bad conditions so I have ordered newer ones along with silicon grease to get everything changed but I want to confirm if the brake travel is due to brake pads only? I want to confirm because I will be taking the tyre off so I want to do everything aik sath, upar sey I use the desi jack so it's hard.

Update: The brake light turns on after the pedal has been depressed almost half way, just a tiny bit before the halfway point. I have a city and it's light turns on the moment the brake pedal moves

The car brakes are like this since I got the car so cant say what normal baleno brake feels like and all other cars in the house have some travel so some extent so I cant judge if the travel is normal. Last year in ramadan I thought it may be due to air in the system and I flushed the brake fluid with newer one but that hardly made any difference. Pics of brake pads are attached

Are all brake cleaners the same? I wanted to get 3m one but that's hard to find and very expensive online so I will get the liqui moly one for 600