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Re: a little off for some groups: 1989 Mazda 626 clacking from top of engine
Honda/Acura Vehicles Discussion group for Honda/Acura vehicles. (alt.autos.honda)
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Re: a little off for some groups: 1989 Mazda 626 clacking from top of engine -
04-03-2007
, 12:11 AM
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I'm crossing this to Honda and Toyota because there are some sharp individuals in these groups, and also in the Ford group since this is a common engine among Fords, IIRC. The problem: 1989 Mazda 626. Over the course of the winter, occasionally on cold days the engine would clack from just under the valve cover. Since I seem to recall seeing somewhere that this engine has hydraulic lifters of some sort, it just seemed that allowing the engine to warm and circulate oil would cause this to stop as the lifters (or whatever!) responded to the rise in oil pressure. It always worked, and when it didn't, I would check the oil, add 2/3 3/4 of a quart, and be done with it. Saturday the oil was down less than 1/4 from the Full on the dipstick. Since it's getting an oil change in about 500 miles, I let it go. This morning I had to make a trip about 30-35 miles one way. When I returned home I noticed the engine was making a louder noise than usual, and when I went to investigate it was the clacking noise from under the Valver Cover. I shut the car off and let it cool. Before I left the house later, I added 2/3 of a quart of Castrol Synthetic (the closest bottle of oil I had) and started it. I let it run for a while but the clacking continued. I added about 1/3 quart of Marvel Mystery and let it run till warm and the noise never went away. After parking the car for about 2.5 hours, when I started it up the clacking was still there. I drove home still clacking, but quieter. The partiulars: this is the 2.0L 12-vavle engine, OHC, new timing belt 3,000 miles ago, fuel injected. It's going to get parked in 1-3 weeks when I take my Supra out of winter storage. Any ideas about what it is or what I should look for? If I find the Haynes I will be able to answer more questions concerning the motor. It looks good and runs great, even with the clacking. Collapsed lifter? |
Ray O
(correct punctuation to reply)
#2
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On Tue, 03 Apr 2007 02:27:53 +0000, Hachiroku ???? wrote: I'm crossing this to Honda and Toyota because there are some sharp individuals in these groups, and also in the Ford group since this is a common engine among Fords, IIRC. The problem: 1989 Mazda 626. Over the course of the winter, occasionally on cold days the engine would clack from just under the valve cover. Since I seem to recall seeing somewhere that this engine has hydraulic lifters of some sort, it just seemed that allowing the engine to warm and circulate oil would cause this to stop as the lifters (or whatever!) responded to the rise in oil pressure. It always worked, and when it didn't, I would check the oil, add 2/3 3/4 of a quart, and be done with it. Thanks to everyone who responded! Ray O wins the prize: It looks like a collapsed Hydraulic Lash Adjuster. These look pretty easy to remove and replace, but I have found a number of resources on the web as to how to clean them. Also, I will try the 'lazy man's' way suggested by another poster, ie adding ATF or Marvel Oil before the next oil change. It was due in 500 more miles anyway, so I'll try 'flushing' it and see what happens. One method suggests simply sliding the rockers and pulling the HLAs out and cleaning them, another prescribes removing the rocker cams and arms and a thorough cleaning. Since the car is so clean, I will probably do this after I park it for the summer! Pray for me...(I can be a Gumby at times!) If the lifters are easy to pull, let them soak overnight in solvent or |
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Ray O
(correct punctuation to reply)
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