Not sure if anyone is able to give any advice on this, have done a bit of research but couldn’t find much on what is normal wear of cylinder walls and not normal. Looking at the bores they feel smooth, with no dents or bumps. Will do a diameter check later to see if is within Mazda’s tolerances. Barring that do they look all good to leave or do these look in need of reboring?
Also in the second picture, you can see rust within the coolant channels that run through the block. Hows best to clean this out without doing a flush when all back together? As planning on fitting new pump, thermostat, hoses and radiator, but don’t want the new parts to get damaged or blocked!
Hi Rob here,
the bores look good you can see the cross hatching which is good, minimal wear if you can still see this, take the head gasket off you will see that there is hardly any blockage in the water ways the pistons also look good all the right color. How many miles, what cc,mx5 or eunos,these engines last a long time very under stressed, if in doubt rev the — of it, had my eunos 14 years
a mile, cheers Rob.
Thanks Robs, Thats good to hear then. Least means haven’t got to venture any further into the engine.
when i clean up head-gasket, is it best clean up any bits that may fall into cylinder with compressed air or vacuum up?
Cars a 1.6 short nose Eunos, 96,000miles on clock
The piston tops need cleaned, the bores diameter needs checked by someone who has used the required measureing equipment before and has experiace of doing this.
No idea if the original poster has done this before and the cylinder head and block top face need checked got flatness.
The problems is where do you stop, do you repalce the oil pump as it is not unkown for the relief valve to stick open and wreck an engine PDQ.
Do you lift out the engine and change the crank rear main seal and the front seal in the gearbox. It would never end!!!
Good luck with the project.
Did wonder about oil pump but oil pressure is good, Engine out on stand at moment with gearbox seals being replaced and rear main seal will be replaced also.
Use a vac, comp air will blow it somewhere else.