Boney Posted May 19, 2006 Posted May 19, 2006 This is the first motor that I have ever opened. Model 19. The first pic is of the bottom of the top {if that makes sence}. The second picture, piston, valves. This was taken right after opening it, I did not touch a thing. It seems to me to have a lot of junk in there but what do I know. I always thought the spark plug was over the piston,,,,,I was surprised to find out it wasnt. Does anyone know why it isnt? Would have thought it would get a better "bang" over the piston ? The picture with the spark plug hole has a large clump of dirt at the bottom of it, is this normal ? Thanx for any help/comments sorry for the inconvienence of the little blue discs, dont know how that happend [url="pop_download.asp?mode=Edit&dir=boney&file=22203"][img]images/disk.gif[/img][/url][url="pop_download.asp?mode=Edit&dir=boney&file=22204"][img]images/disk.gif[/img][/url]
MrSteele Posted May 19, 2006 Posted May 19, 2006 That "clump of dirt" appears to be carbon buildup, and that is normal, or it has been on most I have torn down. Clean it out with either a scraper of wire brush. The carbon deposits suggest to me, a possibility of a little water going through the engine from time to time, also quite normal.
ReedS Posted May 19, 2006 Posted May 19, 2006 Herm, to make your pics show up you'll need to edit the file name. Get rid of the spaces and parenthesis. As for the build up it's called carbon build-up it's a normal condition especially in an old engine. It's a by-product of the combustion process. An engine that's burning oil will produce more of it and can also cause pre-ignition in some cases as well as ocasionally causing a knocking noise due to either physical contact with the cylinder head or by the aforementioned pre-ignition. The piston also appears to be wet if the wetness is oil then there is a good chance that the rings aren't sealing well IMO. This fairly typical of an old engine that needs an overhaul. This build-up is not caused by water as suggested above, in fact an old boy's trick to cleaning out the carbon was to pour just a trickle of water into the carb while goosing the throttle, pretty neat trick, works too. Another neat trick is a water injection system, with out getting into detail it aids the combustion process by cooling air temps in the cylinders which helps create a denser fuel/air charge. Found mostly on strip racers, hot rods and even the ocasional diesel. The hardest part of overhauling a 19 is finding the correct needed parts.
Roy Posted May 19, 2006 Posted May 19, 2006 [img]/club2/attach/boney/P5190149%20%282%29.JPG[/img] [img]/club2/attach/boney/P5190148%20%282%29.JPG[/img]
Boney Posted May 20, 2006 Author Posted May 20, 2006 Thank you all for the great help with pictures and information. Reeds do you know of a local place that may have the parts needed for the overhauling? Does anyone know how to tell if the valves need work ? Also I would like to replace most of the gaskets as there are a few leaks. Thank you all for the great help
RayS Posted May 20, 2006 Posted May 20, 2006 Herman, any Briggs dealer can get you the parts if they are still available. You can also contact the guy in the link below to get parts that are hard to find. http://www.bser.com/
UCD Posted May 20, 2006 Posted May 20, 2006 Boney Your problem with the pictures is with your file names. There can not be any spaces or symboles ( ) in file name.
2burning Posted May 20, 2006 Posted May 20, 2006 Like everyone else says, looks like excessive oil consumption. As to the location of the sparkplug, on all the small flatheads I have taken apart (not too many) the spark plug has always been over above the valves. With a flathead, that is where the chamber space is so that is where most of the fuel/air mixture is sitting. That is where you would want the spark. If it were above the piston, most of the gas/air mixture is squezed out of that area by the piston so you would probably not get good ignition or flame travel. I have read that having the plug somewhat near the exhaust valve helps hold heat in that area and have better combustion, and that it helps keep the plug from fouling. Overhead valve motors would have a better design and location of the plug over the top of the piston like you are talking about.
oldone Posted May 20, 2006 Posted May 20, 2006 Boney, I just put together an old 19. the only gaskets I needed were the pan and carb gaskets. If you take your time taking it apart most of them stay in good shape. Lapped the valves,and grounded the taper down on the crankshaft. That someone had welded up for the flywheel. then replaced the points hold down screw with the right one. sparks and runs good now! Any time I see RTV on a engine,I know theres a problem with someones work on it.
ReedS Posted May 20, 2006 Posted May 20, 2006 Herm, In regards to your valves, the first step will be to check your valve to tappet clearances, if they are within spec the valves may only need to be cleaned, inspected for burning or wear and lapped. If the valve to tappet clearances are to big then either replacing the valves or grinding the seats may repair the clearance issue. The valve guides may need attention as well, too much valve to guide clearance can cause multiple issues, such as a sticking valve or oil consumption. Be aware that some parts are NLA from B&S. Done right the 19 should last at least another 40 years give or take a couple.
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