the inlet valve on my clio broke due to water leak in the head which corroded the inlet valve that seized and broke, (not cam belt) the engine was idling when it went, and although there is a small dent in the piston face everything seems ok, apart from that the effected piston is now 0.75mm lower than the other three pistons when at top of the cylender, and when turning the engine over by hand there is a tight spot when all four pistons are midway in the bore. the engine turns perfectly on the starter with no knocking sounds,or signs of binding. can I chance buying just a new head or will the slight damage to the no 3 piston make it better to replace the whole engine, the car is 1991 clio diesel, with 70k, and I live in Spain, where old cars cost a fortune! but spares are cheap.
2006-09-23 23:25:45 · 11 answers · asked by ian g 1 in Cars & Transportation ➔ Maintenance & Repairs
the longer you leave a damaged valve unrepaird yes it will cause unrepairable damage to the block by grinding sorry
2006-09-23 23:39:52 · answer #1 · answered by a1ways_de1_lorri_2004 4 · 0⤊ 0⤋
Sounds like possibly a bent con rod but 0.75 mm is real hard to judge with a straight edge and feeler gauge.
You wont have damaged the block but if the piston or con rod is damaged and weakened it may break in service and this may well destroy the block, however if twer me II think I would re assemble it with a second hand head and try it,
If only new heads are available I think I would get a recon or good secondhand engine.
The tight spot could be normal as all 4 pistons move a long way per degree mid way up the bore yet they hardly move up or down at all for several degrees at Top/bottom dead centre
2006-09-24 06:49:38 · answer #2 · answered by "Call me Dave" 5 · 0⤊ 0⤋
Two options depending on your own proficiency:
1)If you have the tools and expertise, take out the engine and overhaul it, specifically replacing con-rod and piston on said cylinder. That way you will be able to inspect the crank main bearings and big-ends on the other 3 cylinders. Properly done, an overhaul will give you an as-new engine provided you DO IT YOURSELF! Do not buy a reconditioned unit - most are worse than a good second-hand engine because of inferior parts and shoddy workmanship.
2)Buy a second-hand engine with a guarantee from a breaker and fit it or get it fitted. Easier and quicker and probably cheaper than 1st option. Also, this is your only option if you are not confident with performing an overhaul yourself.
2006-09-24 08:22:25 · answer #3 · answered by mercyam01 2 · 1⤊ 0⤋
Get a new or good used engine. You more than likely would be running on 3 cylinders if you repair the head and not the piston. because the piston has to travel the full length to create the compression to ignite the fuel. If the piston doesn't compress the air and fuel enough the fuel and air won't heat up enough to blow up the fuel therefore not creating power in that cylinder And have fuel exiting through the exhaust into your exaust pipe,which of course is not good.
2006-09-28 18:21:11 · answer #4 · answered by whtsthislif4 5 · 0⤊ 0⤋
if that piston is 3/4 mm lower than the rest then you must have bent the connecting rod(con-rod), this will have seriously weakened it so will no doubt snap soon killing your engine completely, the block should be o.k. but you never know, so check it out,
change the con-rod (check for tight spots with number 3 piston out)and check tdc positions again, if that's fine, put new head on,
might as well change big end bearings on all cylinders at same time as 'parts are cheap'.
hope this helps.
2006-09-24 06:49:05 · answer #5 · answered by fatbadge 3 · 0⤊ 0⤋
The tightness of engine when pistons are even concerns me. You probably going to have to mic & rebuild that engine, because there is no telling what damage is still in there.
2006-10-02 02:04:41 · answer #6 · answered by nbr660 6 · 0⤊ 0⤋
If piston is lower than others it's likely it has damaged the small end on the con rod Undo big end take out con rod and check.
2006-09-24 06:44:10 · answer #7 · answered by beegeecee 2 · 0⤊ 0⤋
new piston & conecting rod is required first
check crank as well the block it self should be ok
but it can be cheaper to bye a recon engine & a lot less work to
plus it will have a garrentee
where in spain do you live i live near velez malaga
witheringtonkeith@yahoo.co.uk
2006-09-24 09:09:49 · answer #8 · answered by witheringtonkeith 5 · 0⤊ 0⤋
stick in a new piston and con rod that should solve problem
2006-09-25 09:31:25 · answer #9 · answered by Anonymous · 0⤊ 0⤋
I WOULD NOT WASTE TIME AND MONEY REPAIRING IT, BETTER TO BUY A RE-CON ENGINE.
2006-09-30 17:32:06 · answer #10 · answered by melas 6 · 0⤊ 0⤋