my engine overheated recently after some debris from the road jammed in the cooling fan. the engine (3 litre V6 Nissan) has now been stripped revealing some rings have siezed up causing very faint scratches to some but not all of the bores. Obviously I dont want to do more damage but can I polish out the scratches with a cloth and some smooth grinding paste or is there a resonably priced honing tool available for the diy enthusiast?
2006-07-22 22:20:06 · 9 answers · asked by bestfunwithoutbatteries 1 in Cars & Transportation ➔ Maintenance & Repairs
Sorry anything that you can feel with your thumb nail requires checking and measuring by a reconditioning shop. If your bores are good and tight it may be that a light hone will clear the marks, yet still keep the piston/bore clearance within service limits.
This cannot be done at home without specialist honing tools, not the glazebusters that you see in accessory shops. The surface finish must be done correctly with a plateau finish and croshatching at 120 degrees included angle. High oil consumption and incorrect ring bedding in can result if this is not carried out correctly.
If the hone cannot clear the marks, then the only solution is a rebore and oversize pistons.
Either way, seek professional help and advice.
2006-07-23 02:44:32 · answer #1 · answered by Anonymous · 1⤊ 0⤋
There are several honing tools, or deglazing tools on the market and are available at most car accessory shops or tool suppliers. The one I find best works in an electric drill, and consists of a sort of tripod arrangement with three very fine grinding stones. The legs of the "tripod" are spring loaded and when compressed, fit into the cylinder bore. These tools will only remove the surface glazing of the bore and very fine scratches. If the damage is too severe the only real course of action is to have the block checked by a professional and possibly re-bored.
2006-07-22 22:44:47 · answer #2 · answered by RICHARD C 1 · 0⤊ 0⤋
Sure it can be done at home - but this is quite an undertaking.
It requires dropping the lower end so that the pistons are no longer blocking any of the cylinder walls. Typically the block sits in an engine stand bolted to the block and from there there is a drill attachment that looks like a chimney sweep with abrasive balls attached to the end of every wire. This is placed into the cylinders and spun with a lubricant and watched very closely - moved from cyl. to cyl. being sure not to over bore the cylinders. - you may need a tool to measure how much you have removed from the cyl. walls.
The pistons need to be checked for damage and the rings need to be replaced at the very least.
That's pretty much all I know about that. Kind of big for a home project - unless you have the room, time, tools and a head for it.
good luck.
2006-07-22 22:34:19 · answer #3 · answered by drewwers 3 · 0⤊ 0⤋
Check out the following web site for a picture of a reamer I have that is perfect for the shade tree mechanic to hone engine cylinders:
http://www.mfgsupply.com/SmEngToolsCyl.html
See the top tool shown... #32-704. I have such a reamer and it is used with a portable drill to make a good cross hatch pattern on the cylinder walls and break the glaze from past piston stroke.
If the feint scratching you are referring to is indeed just surface imperfection, you might get lucky and be able to hone it out. Clean ring grooves and new rings might just get you a sealed cylinder. Just be sure to keep the hone moving in and out of the cylinder when in use and keep it well oiled and clean.
Good luck!
2006-07-22 22:32:28 · answer #4 · answered by Les 4 · 0⤊ 0⤋
the 3 legged type from JC Whitney (maybe auto-zone, Pep-boys, etc) will work for what you want. it isn't precision honing but it doesn't sound like you need or want that. If you just want to get a cross hatch on cylinder walls you can use a piece of steel rod with a slot down length( hacksaw) and some 1" wide emery cloth to make a scratch brush plus a power drill motor, low rpm and fast up and down movement( if you need more explanation than that you need someone else to do this)
2006-07-22 22:32:04 · answer #5 · answered by 1crazypj 5 · 0⤊ 0⤋
Check rental shops or auto parts stores in your area. Some rent/loan tools. If you hone the cylinders, make sure you clean out the cylinders really well after honing (soapy water). Small scratches should not be a problem.
2006-07-22 22:34:24 · answer #6 · answered by the mazda mechanic 4 · 0⤊ 0⤋
please heed this answer...
To hone the cylinders on this engine strip to bare block and take to an engine re-conditioner.The tools you can buy at halfords will hone bores but do not leave the correct surface finnish.
The bores have to have a 45degree cross-hatch finnish and be platau finnished with diamond emmbedded cork to a 30 to40 micron surface finnish.It has to be done like this because low periphial pressure rings are used ,to rough a finnish destroys rings resulting in high oil consumption.After bores are honed always replace rings.
2006-07-22 22:36:41 · answer #7 · answered by Anonymous · 0⤊ 0⤋
That's not slight damage...that's damage. You will need to take the engine in and have it bored 10 or 20 over. You can buy new pistons OR have cast iron sleeves put in to get it back to factory bore to reuse your pistons. Good luck.
2006-07-22 23:46:38 · answer #8 · answered by jeff s 5 · 0⤊ 0⤋
May I suggest for you to bring it to your trusted engine rebuilder this things need special attention and they follow strict measurements, you might make the condition severe. And have the engine head block checked for any leaks that might have occured during the overheat.
2006-07-22 22:26:34 · answer #9 · answered by Jetty 4 · 0⤊ 0⤋