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Forum: S-Series General 05-31-2022, 01:05 AM
Replies: 23
Views: 910
Posted By steinfel
Re: Sudden onset of engine clacking/knocking noise while driving uphill

So I was able to take a listen to the running engine with my doctor friend's stethoscope and the noise was loudest at the top of the engine, specifically by the #4 intake valves. Both she and I...
Forum: S-Series General 05-25-2022, 11:40 PM
Replies: 23
Views: 910
Posted By steinfel
Re: Sudden onset of engine clacking/knocking noise while driving uphill

Thank you for your ideas. I'll try the thicker oil test, but I have to get out to the store and get some first.

I'll turn the car around in the driveway, under minimal rpm/engine load which will...
Forum: S-Series General 05-23-2022, 03:46 PM
Replies: 23
Views: 910
Posted By steinfel
Re: Sudden onset of engine clacking/knocking noise while driving uphill

I have not driven the car since the onset of the noise. Just ran the motor for the various tests described above. The oil I've been using is listed in the description above, excerpted here:

Oil...
Forum: S-Series General 05-22-2022, 06:14 PM
Replies: 23
Views: 910
Posted By steinfel
Re: Sudden onset of engine clacking/knocking noise while driving uphill

More data:

A friend came by and we did a compression test, but without warming up the engine. Cold test numbers were left to right 160, 165, 160, 165. Cylinder 4 has compression, which goes...
Forum: S-Series General 05-22-2022, 12:40 AM
Replies: 23
Views: 910
Posted By steinfel
Re: Sudden onset of engine clacking/knocking noise while driving uphill

As horrible as that sounds, it is the outcome I would prefer over it being a failed main bearing scenario. It would be less work for me to take the cylinder head off than to pull the block. My...
Forum: S-Series General 05-20-2022, 08:00 PM
Replies: 23
Views: 910
Posted By steinfel
Re: Sudden onset of engine clacking/knocking noise while driving uphill

Thanks again for your thoughts. I have more information:

So I took out each of the spark plugs and noticed that the plug on cylinder 4 was fouled with oil and incomplete combustion deposits, while...
Forum: S-Series General 05-19-2022, 12:07 AM
Replies: 23
Views: 910
Posted By steinfel
Re: Sudden onset of engine clacking/knocking noise while driving uphill

So I took a look at the valve train from the top and did not see any chips, dents, or notable damage to the camshaft lobes. I pressed on all of the lifters and found all to be firm except for the two...
Forum: S-Series General 05-18-2022, 10:44 PM
Replies: 23
Views: 910
Posted By steinfel
Re: Sudden onset of engine clacking/knocking noise while driving uphill

I had the shop assemble the block internals. I would like to assume that they did the job correctly, since I paid good money for it. I brought the block to them to mic and bore the cylinders, as well...
Forum: S-Series General 05-18-2022, 04:46 PM
Replies: 23
Views: 910
Posted By steinfel
Re: Sudden onset of engine clacking/knocking noise while driving uphill

Thanks for the ideas.

I'll take a look at the cams and try to see if there are any suspect marks on the lobes from a bad lifter. Not sure what to expect, but I'll note anything that looks suspect....
Forum: S-Series General 05-17-2022, 03:18 PM
Replies: 23
Views: 910
Posted By steinfel
Re: Sudden onset of engine clacking/knocking noise while driving uphill

This is an interesting approach to assessing the problem. I take it that measuring the noise pulse characteristic could point to whether the knocking noise is at the piston/crank level or valve/cam...
Forum: S-Series General 05-17-2022, 03:37 AM
Replies: 23
Views: 910
Posted By steinfel
Re: Sudden onset of engine clacking/knocking noise while driving uphill

Thanks for your time and thoughts.

I would not say a bad lifter is impossible, as there had been some limited lifter noise at times on morning startup, moreso during winter months. As the engine...
Forum: S-Series General 05-16-2022, 06:18 PM
Replies: 23
Views: 910
Posted By steinfel
Sudden onset of engine clacking/knocking noise while driving uphill

This is my first post here, but I have been reading this forum for many years. There are some truly knowledgeable people on here, so I thank you all for indirectly helping me for so long with your...
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