Both are Mild Acids, Pickling Vinegar is Stronger than Reg 7% vs. 5%, however, even mild Acids will eat Metal. And as Racer said, it is not going to stay in the Block.I will do the vinegar and water... my son asked what about using CLR ? I told him I would ask.. lol thank you
you obviously had a problem with one breaking a ring land , yes that was common when people run them low on fuel and leaned them out .Hardy Bulletproof... They are well known for Piston Ring Problems
135 and other 2.0 V6 mercs also had the same issue with the rings , its to do with piston speeds and not enough fuel.Broken rings is the most common reason for these motors to be put to rest.----I do not have enuff fingers and toes to count them in my storage for parts / rebuild.-----The design of the top piston ring is the issue.----I estimate that 9 out of 10 will suffer from this disease !!
no need to stress , yhey are good solid motors ,Man for someone wanting to fish and enjoy a boat doing it , after hearing all of these things almost makes me regret getting one. Lol
ha ha , i used to just rebuild them with used piston and rod from a scrap motor and they would run on for years.The V-4 90 is a sound design , except for the top piston ring.---Very good durable gearcase.-----Do a compression test for now and future reference.-------Rebuild it with Wiseco pistons if needed and use it for another 20 years.----Better than a 4 stroke as far as maintenance.----Notice all the 4 strokes that suffer from water getting into the engine oil sump !-----Did a compression test on a low hr 1990 model 100 HP a few weeks ago 135 / 130 PSI shown on my trusty gauge.
looks ok to me , even is good ,those cheap pressure gauges do not always read correctly so the actual numbers don't mean that much so long as they are even as yours are.I did a compression test on the motor all 4 are pretty close to the same reading
Running low on fuel does not hurt the engine. Common misconception thereyou obviously had a problem with one breaking a ring land , yes that was common when people run them low on fuel and leaned them out .
as posted the 3 things that will kill them "" running lean is one of them"""..
rings on any 2 smoke will cook if you run them lean .
iv had many of these motors and other 2 smokes that have died from the same fate through my hands most have been broken by the owners "" user error "" and its just that.
running the tank low at full throttle ,or tank runs out of fuel @WOT (worst thing that can happen to a 2 smoke), engine runs lean > a few outings later after you already have a broken ring land or cracked ring , ,ring snaps and its all over .
? would you like to see pics of burned up cylinders where motor has ran lean or low on oil in the tank , oil or fuel has been replenished but damage was already done.
anyway , that said ,with your condescending post , i hope you have learned something from my reply .