Guest shane Posted June 19, 2016 Share Posted June 19, 2016 Hello. Would anyone know if a engine could Be unsized. Any information would help. Thanks if you need two know more information about the engine ask me and I will find out. Quote Link to post Share on other sites
Island Time 1,248 Posted June 19, 2016 Share Posted June 19, 2016 Why is it sized? Overheat, lack of oil, corrosion? What make and model... Quote Link to post Share on other sites
erice 732 Posted June 19, 2016 Share Posted June 19, 2016 https://www.google.co.nz/search?q=how+to+unseize+an+engine&oq=how+to+unseize+an+engine&aqs=chrome..69i57j69i60l3j69i65j69i61.6558j0j4&sourceid=chrome&ie=UTF-8 could try putting a cup? of diesel through the spark plug or injector holes leaving it overnight then the next morning working it back + forth with a long breaker 1/2" bar, (tube extension?) and big socket on the crankshaft nut that might break it free but the gear is not something found in most garages but why did it seize? is this the old volvo single you had problems with in the south island? did you ever read the manual pdf that a link was posted too? Quote Link to post Share on other sites
Guest shane Posted June 19, 2016 Share Posted June 19, 2016 I left that engine in my old boat. This is a a moter I'm thinking about fixing got it for free. It was from corrosion, petta, not sure model possible 8hp Quote Link to post Share on other sites
Guest shane Posted June 19, 2016 Share Posted June 19, 2016 The guy said motor has sized solid, motor in striped had oil down bore for couple years trying to free it up. Is it still possible two get it fixed. Quote Link to post Share on other sites
Island Time 1,248 Posted June 19, 2016 Share Posted June 19, 2016 Virtually any motor can be fixed , provided the block is not corroded beyond serviceable limits. If it was seized for "years" and oil could not fix it, then it is likely bad. It might not be worth repairing. You said it is stripped? Does that mean it is really in parts? If so, then the condition of the block, cooling gallaries, bores and head mating surface should be visible. If it is a sleeved engine, then the sleeves can be replaced, If not, then the bore condition will dictate what must be done. If its a rebore, new pistons, rings, bearings, crank machining, block and head skim, valves, valve guides, springs and seals, head crack test, gasket set, injectors, injector pump service etc, then that is a full rebuild, and is likely not worth the money. This is a job for an experienced mechanic, or the money spent is likely wasted. You'd need specialist tools as well to measue it all to ensure everyting is within allowable tollerances. At this point I suggest you take it to an engine reconditioner and ask for a price. Report back the response. Otherwise detailed pics would help. External and internal. Quote Link to post Share on other sites
Steve Pope 243 Posted June 19, 2016 Share Posted June 19, 2016 Of course it is possible, whether it is economic to do so is another matter. If possible find out what caused it to sieze, Lack of oil?? cooling?? if lack of oil you will have to have the crank ground as well as a rebore, over size piston and rings, valves?? guides?? bearings?? etc. etc. Take the head off and find a piece of wood that fits the bore and tap gently (to start with) you may have to use more force if it doesn't move. If possible remove the crankshaft first. Most likely the bore, piston and rings will be toast. Check out the prices and availability of (Petter?) spares. Don't look for marine spares, Petter are / were an industrial motor therefore parts shouldn't have marine prices. Quote Link to post Share on other sites
Island Time 1,248 Posted June 19, 2016 Share Posted June 19, 2016 Steve, simultaenous post saying about the same thing great minds think alike I guess! Quote Link to post Share on other sites
wheels 543 Posted June 20, 2016 Share Posted June 20, 2016 Great advice above.I can pretty much bet the motor will be shot. If it was seized due to water in the bore in a salty environment, then the corrosion that takes place between the Aluminium Piston and the steel bore will result in the bore being well and truly eaten into and the Piston will be badly corroded and likely damaged as well. At the very least, you will need a Bore Hone, Piston Rings, Bearings, Valve grind and lapped in, Seals and Gaskets. At the worse, as IT has laid out for you and likely not worth fixing. Quote Link to post Share on other sites
erice 732 Posted June 20, 2016 Share Posted June 20, 2016 Petter Type 5,6,7,8 HP at 1500 RPM Single Cylinder http://www.stationaryengineparts.com/Petter-AV-and-AVA-80mm-Piston-and-Pin.html Quote Link to post Share on other sites
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.