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Thread: 5mge knock/tick
08-05-2012, 01:29 AM #1Junior Member
- Join Date
- May 2011
- vancouver island
i have a 85 cressida it has new rod bearings a rebuilt head i.e valves stems and pressure check and that shit that the shop did and thats it lifters and rockers seem okay along with the cams but i can get it running and it runs fine till around 2000 3000 rpms then gets a real bad tick/knock any tips or advice is much appreciated i will try anything p.s i suck with timing ive done the tdc marks on the crank and camshaft marks line up with the cams and the distributor points straight down but have been told spin the crank a couple times some info on this would be also good
08-06-2012, 09:43 AM #2
if its from the top end of the engine might be that the valve cover is tighten over the torque specs an the rocker arms are hitting
08-10-2012, 12:42 AM #3CelicaSupra.com Member
- Join Date
- Apr 2008
- nashville tennessee
knocks and tick are as different as dogs and cats. how loud is your noise? is it metallic? is it just one repetitive sound or are you hearing many noises? i once had a slightly similar sound, almost like it had two exhaust's. i know its a weird way to describe it. in my case i had a blown headgasket between cylinders 3 and 4. it was swapping compression between those cyclinders. having said that, a compression test may be helpful.
given the severity of a potential knock on a freshly machined engine, I would pull the pan and take a look at the rod bearings. its very possible an undersized bearing was used that allows too much oil clearance, which causes a knock. if you catch it early on, damage will be minimal. wait too long and youll be in a grand at the machine shop. it would be worth half a days labor for the peace of mind.
if its a tick, then look into the valvetrain. the lifters suck. how did you check the lifters? if they dont hold pressure well, you can push down on them and actually hear them click if worn enough.
also, how is the ignition system? has it been maintained recently? how about the fuel system? emissions? you could be hearing spark knock, detonation, pinging, or something else. IF you rule out the rotating assymbly, you could take your car to emissions testing and see what its like coming out of the tail. Improper combustion that leads to bad sounds will certainly throw off emissions. It would be a startwww.sparrowmotive.net
Demoted to rank of Driveway Grass Killer First Class:
1985 Toyota Celica/Supra 5M-GE 5spd 270,000 miles and ticking( no really the engine is ticking)
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