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| MazdaSpeed 3 - Engine, Transmission & Driveline Discussion of engine, tranny and drivelines. |
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09-26-2019, 09:14 PM
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(Thread Starter) |   Not Ranked : 0 score  Chain rubbing on valve cover? Hi, I have a 2008 Mazda CX-7 with a 2.3L turbo engine with 143,000 miles. I drained the oil from the oil pan and after looking at the oil found glittery metal shavings. After doing some more poking around the engine and removing the valve cover it seems that the timing chain is rubbing on top of the valve cover causing metal shavings to be distributed throughout the engine. What would cause this to happen? Could I solve this by replacing the valve cover? Any input would be extremely helpful! Last edited by Crazy8Ballin; 09-26-2019 at 09:27 PM. |
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09-27-2019, 12:02 AM
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(Thread Starter) | Not Ranked : 0 score Doing some further research I also realize that chain tension & the VVT can be a contributing factor to cause rubbing on the valve cover but my chain tension seems good...so I am unsure of where to go from here. |
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09-27-2019, 08:29 AM
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| Not Ranked : 0 score You need the timing chain/VVT actuator replaced. That's one of the worst cases I've seen, the chain actually chewed through the ribs of the cover. Your car is a ticking time bomb. Get it replaced ASAP. |
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| The Following User Says Thank You to ArmanRus For This Useful Post: | cyclist20 (09-27-2019) |
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09-27-2019, 11:17 AM
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(Thread Starter) | Not Ranked : 0 score What exactly does a bad VVT actuator do? Does it cause slack in the chain that in turn causes the chain to rub on the valve cover? |
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09-27-2019, 08:15 PM
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| Not Ranked : 0 score It stretches the timing chain until your tensioner can't keep tension, hence the gouges you see on the valve cover. |
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| The Following User Says Thank You to ArmanRus For This Useful Post: | Crazy8Ballin (09-28-2019) |
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09-27-2019, 09:31 PM
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| Not Ranked : 0 score Symptoms are classic for VVT actuator failure. Known issue. Mazda issued a bulletin and offered free fix up to a certain number of miles by a certain time deadline. Basically an extended warranty on that issue only. Had mine done then. They replaced the chain as a part of the extended warranty. Do it or get it done before it jumps time and royally fucks up your engine. When valves are still open at the same time that pistons reach top dead center, they collide and the result is catastrophic.
__________________ 2017 Audi Q5 3.0 T (supercharged) Stage 2+ EPL tune, JHM overdrive crank pulley, EPL supercharger pulley, ZF8 TCU tune, aFe/034 intake, modified air box. 480 hp. Sunlight Silver '08 MS3 GT Mods: (Sold 1/25/2019 after 10+ years of ownership) BNR Stage 1 (to fix smoking K04 turbo), TurboXS 3" Catless DP/RP "Stealthback" into stock CBE, Vibrant 3 inch Ultra Quiet Resonator in RP section, Magnaflow 3 1/2" exhaust tip, Mazdaspeed CAI w/air straightener and K&N conical filter, NGK 6510 Iridium IX one step colder plugs, Hypertech tune, Autotech HPFP internals, Stock BPV (works perfectly), Yokohama Advan Neova AD08R's (stock size on stock rims); Hawk HPS pads; SURE RMM; Grimmspeed EBCS (2 port mode), Bilstein B6's, SPC rear camber arms. |
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| The Following User Says Thank You to MSMS3 For This Useful Post: | Crazy8Ballin (09-28-2019) |
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