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Dewey29 · 03-23-2021, 07:53 PM

I adjusted the main and rod bearing clearances last summer on my 29 roadster and she has run great for about 1300 miles. During the past 3 outings I've starting noticing a slight but consistent knock while cruising between 35 to 45 mph. It's only on level roads, not during deceleration or acceleration. Also noticed it goes away as I move the spark lever up? I plan to remove the pan again and investigate, but I'm asking if there is anything else to consider before diving back under the car?

Thanks in advance for any help guys!!!

03-23-2021, 07:53 PM	#1
Dewey29 Junior Member Join Date: Nov 2018 Location: Birmingham, AL Posts: 17	Engine knock at cruising speed? I adjusted the main and rod bearing clearances last summer on my 29 roadster and she has run great for about 1300 miles. During the past 3 outings I've starting noticing a slight but consistent knock while cruising between 35 to 45 mph. It's only on level roads, not during deceleration or acceleration. Also noticed it goes away as I move the spark lever up? I plan to remove the pan again and investigate, but I'm asking if there is anything else to consider before diving back under the car? Thanks in advance for any help guys!!!