ta63-1uzze Posted February 9, 2015 Share Posted February 9, 2015 yo so has anyone ever jumped a tooth and not had mashed valves? miss's car wont start this morning, drove fine in the weekend with no issues or faults , strange sounds or anything to cause concern I just checked all the normal shit, fuel pressure , spark , injector pulsing, ect. . . cover the simple stuff all looking ok . I just did a compression test and its got 60 psi across all 4 , dry cylinder, and cold engine, all plugs out , throttle wide open, so that's shit as . ha so I suspect its jumped a tooth, I also believe they are interference engines, so this begs the question if it just jumped one tooth do they mash valves?? Quote Link to comment Share on other sites More sharing options...
UTERUS Posted February 9, 2015 Share Posted February 9, 2015 Non interference mang. Here's a handy dandy picture to help you decide if it's out. http://iforce.co.nz/i/0gk3exub.xxm.jpg 1 Quote Link to comment Share on other sites More sharing options...
Seedy Al Posted February 9, 2015 Share Posted February 9, 2015 put a 4age in it 1 Quote Link to comment Share on other sites More sharing options...
ta63-1uzze Posted February 9, 2015 Author Share Posted February 9, 2015 ah, thank fuck for that. I ran out of time tonight and it to dark to see. will throw a kit at it tomorrow night and hopefully that is that. yeah I would be keen 2 X 4AGE that would be mean, call it a 8aaggee Quote Link to comment Share on other sites More sharing options...
ta63-1uzze Posted February 9, 2015 Author Share Posted February 9, 2015 ah, shit balls , the interweb recons that it is interference, its a 20valve, black top. not a 16v . oh well. fuck it , damit , now I wont be able to sleep cause I will just be thinking about getting it going all night . gaaaaaaaaaay !!! Quote Link to comment Share on other sites More sharing options...
Bling Posted February 9, 2015 Share Posted February 9, 2015 I know someone that mashed valves on a blacktop, could get lucky though. Old belt? Quote Link to comment Share on other sites More sharing options...
NickJ Posted February 9, 2015 Share Posted February 9, 2015 How many teeth do you have to jump before things get messy? surely you could go a few before things get close? Quote Link to comment Share on other sites More sharing options...
Seedy Al Posted February 9, 2015 Share Posted February 9, 2015 yeah, depending on how many teeth out you are you might be ok I must say, I actually as a mechanic have never seen a motor jump teeth. Keen to find out how you get on with this I would pull covers, check marks, put kit on a go from there. Quote Link to comment Share on other sites More sharing options...
sentra Posted February 9, 2015 Share Posted February 9, 2015 if your getting 60 pounds your valves are probibly fine, measure your valvetrain clearance and see if there hanging up. Quote Link to comment Share on other sites More sharing options...
japawagons Posted February 9, 2015 Share Posted February 9, 2015 Oh seedy you need to work on more Alfa V6's... They eat stones through the cambelt covers and jump teeth on the rear exhaust cam. If your lucky that is. Quote Link to comment Share on other sites More sharing options...
Seedy Al Posted February 9, 2015 Share Posted February 9, 2015 im good thanks I will stick to the mpvs and highlanders Im used to 2 Quote Link to comment Share on other sites More sharing options...
ta63-1uzze Posted February 9, 2015 Author Share Posted February 9, 2015 I have seen it before , but typically on an old belt that has had bad oil leaks, or cause some dumb ass hasn't tensioned the belt correctly, or they haven't rotated the engine then checked the tension again etc. poor fitting.. . . . I have even had a customer that tried driving through a big as fuck puddle and the water went under the covers, made it skip 3 teeth, but was sweet , just threw a kit at it and was all good. it got a new belt about a year ago, it was done by the previous owner. only done 8000 km since it was done. (ex company car, auto sparky) have receipts etc. all seals water pump tensioners the lot.bnt stuff so gates belt , good normal stuff , I ran out of time to pull it down enough to get to the tensioner/lower half , got to dark to see what I was doing., it has tension across the cam sprockets and on the tension side , but I couldn't see if the slack side or tensioner. so that leads me to think its skipped and not broken altogether. "how many teeth do you have to jump before it gets mess" that is the magical question , hence why I am asking all you 4age boys., it was running fine so I can anly assume it didn't jump whilst it was running, and it still turn over freely on the starter, but that doesn't prove that its not touching. . . hopefully I can get home early tomorrow and get into it fast as whilst the sun is still out . Quote Link to comment Share on other sites More sharing options...
thegreatestben Posted February 9, 2015 Share Posted February 9, 2015 I've had a bnt hyd tensioner die on me before. Checking marks shouldn't take you long. Just remove top half, line up dots on cam gears and tdc on lower cover to crank pulley Blacktop very definitely interference. Only 4age that is 1 Quote Link to comment Share on other sites More sharing options...
Truenotch Posted February 9, 2015 Share Posted February 9, 2015 They're definitely an interference motor. Silvertop isn't, blacktop is. Not sure how far you'd need to skip before it ate valves though... I'd imagine a fair few teeth though. Quote Link to comment Share on other sites More sharing options...
Truenotch Posted February 9, 2015 Share Posted February 9, 2015 But also i don't think you'd get such a large drop in compression from only skipping one tooth... Is your gauge good? Quote Link to comment Share on other sites More sharing options...
Rookie Posted February 9, 2015 Share Posted February 9, 2015 Is the head torqued down? 6 Quote Link to comment Share on other sites More sharing options...
ta63-1uzze Posted February 10, 2015 Author Share Posted February 10, 2015 so got covers off,all nice and dry, tension is a little low for my liking, but still acceptable . timing marks line up ,so that rules out that so now I'm going to whip of the rocker cover and see what's going on with the top half of the engine. its very easy to turn over by hand and has little compression at all, I can spin it over with my short 3/8 drive ratchet on the crank. yes its used and good compression tester. have checked my other car to verify that its not reading wrong. yes the head was/should/hopefully is torqued down, it hasn't had any overheating issues, doesn't have the death smell or anything. nothing to indicate that its blown all of the head gasket ? lol I cant think of why this has happened. hope something is in the cam area , be back shortly Quote Link to comment Share on other sites More sharing options...
downtrail Posted February 10, 2015 Share Posted February 10, 2015 Hasn't shorn off the key for the bottom pulley or something stupid? The early Mazda BP's would do this. then timing would be all over the place. Quote Link to comment Share on other sites More sharing options...
ta63-1uzze Posted February 10, 2015 Author Share Posted February 10, 2015 well nothing to report under the rocker cover, looks normal, I've put the battery on charge. will get some clean oil tomorrow and do a wet comp test see what I get. also getting a second compression tester to try out tomorrow. hopefully its got a leak down attachment . I cant disassemble mine to fit an aero fitting to it arrrrr. yeah I couldn't get the crank bolt off even my electric rattle gun wasn't strong enough, and it can do Honda crank bolts. so its way over fucking tight . but I don't think the key way is broken cause other wise it wouldn't make any compression at all . the ignition system is in poor state, so will get some new bits for that tomorrow too whilst I'm at bnt , this car has not been looked after as well as I was led to believe . Im not really fussed cause I know I can fix what ever it is that is the fault. It just the not knowing that is doing my head in, cant stop thinking about what it could be . shit like this just makes me ocd , I have to know why Quote Link to comment Share on other sites More sharing options...
CorollaGT Posted February 10, 2015 Share Posted February 10, 2015 Checked valve clearances? Seen/heard of these getting valve recssion (mine was down to 120psi on one cylinder where the problem was). Quote Link to comment Share on other sites More sharing options...
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