Radiator Flush - Citric Solution - Alto DIY

[krafiq]

My query is how do you take wet reading and dry readings?

[nfssaad]

take a reading. then drop a little oil in the spark plug hole and take the next reading.

first is dry, second is wet

[krafiq]

Ok. Now I get it

[Xulfiqar]

umm.. stop what you are doing.

on twin plug engines, you remove only one plug, and never do a compression test on a running engine, you will destroy your compression tester in an instant. Its done at cranking speed only (approx 300 rpm)

if you remove both plugs from a cylinder, you will have a hole to deal with.

[Moderator]

[ahmedali.kas9]

So, I now finally have the time and opportunity to do this. I went ahead and got Caltex coolant and tstat and things were going rather swimmingly well since then. (had to keep ignoring and emptying out the rust deposits) My radiator burst due to a choked lower radiator hose (the rubber lining with collapsed upon itself and deprived the system of coolant = excess pressure and radiator blew up wasting all my precious coolant. Now it's temporarily on water.

I will be removing tstat and attempting this tomo. heater core is not connected (hasn't been for over 10 years) so I'm assuming general water content is lower than 4 liters so 350-400g of citric acid should suffice. after a 15 minute cycle I will empty the contents and flush with a hose. I'm only confused about flushing the block out, how do I do that?

[Xulfiqar]

Keep water flowing via heater pipes into engine and out of lower radiator hose, it will remove the flushing agent and debris

Or you can remove the waterpump and flush.

[msabbasi]

I'm only confused about flushing the block out, how do I do that?

On my 1948 car they have provided 2 drains. One at the bottom of the radiator and another at the back of the block. I guess sometimes old engineering was better than modern engineering

[ahmedali.kas9]

I'm still not clear about this, as water from the inlet hose (top radiator hose) goes into the radiator (coolant coming from inside the engine block) goes through rad, cools and from the lower radiator hose goes back into the block. So will this me some sort of reversal of the water flow? Won't that damage the water pump?

According to this diagram I was under the impression, that I'd just unhook the hose in the red encircled area and let the water come out while simultaneously running water through a garden hose into the lower radiator hose, so clean water would be going through the block and the water would the come out clear and this way the radiator would be bypassed hence on debris getting stuck in rad. I'd do this while the car will be idling so the water pump would help clear everything out.

This is what my heater connections look like, so if I do as you say, heater pipe connection which is the one going into the intake manifold or the metal pipe coming in directly from the water pump?

This is the heater connection in my car

So what I've deduced is I'm supposed got put a garden hose into either the intake manifold inlet or the metal pipe directly from the water pump inlet to flush out the block? Not sure?

[ahmedali.kas9]

Oh and on a siednote, I am currently using 10w30, my next plan was to go to fully synthetic 5w30 but since they are essentially the same thing (although I could use easier cold starts because my autchoke is not in working order) I was thinking about about going to 5w20 but then I was like what about 0w20. Neither of these are obviously mentioned on any manuals I could get my hands on. But my concern is the temp ranges for w20 engine oil. w20 maxes out at 20c from what google says and karachi temp is around 35c+ recently. ( But I'm confused to as what difference outside temp makes as engine is supposed to be running on the same temp regardless).

Please offer your insight on this, should I go down to 0w20 or 5w20?

What benefits/risks am I looking at going down to either?

[ahmedali.kas9]

Perhaps so, but I think it's posable that the availability of engine drainages was primarily due to a lack of corrosion inhibitors, like coolant as mostly water was used at the time. Frequent draining of the block could be something needed at the time to avoid rust buildup? Maybe, I'm not too keen on that theory.

[the_mira_guy_08]

The thinnest oil for G series engines is 5w30. Same for the F series engines. Like the F10A in the Alto and the F8B in the mehran/bolan/ravi.

[ahmedali.kas9]

welp, a 15 minute cycle with 250gs of citric acid clean up the radiator very nicely. Still not satisfied with the pipes. Now I'm going to do a second round with 300gs. This time around im thinking of dumping the undissolved citric acid crystals in the lower radiator pipe and the plug it back into the bottom of the radiator and the revving the engine on higher rpms for another 15 mins. Fingers crossed! I hope my new gasket doesn't breach.

[Proverbial_Slang]

I think you need to increase the time instead of acid concentration.

[MoizIrfan]

After 10 Years. Thread is still alive