My logs for the latest modpack are attached. The tanks with no sound in my garage are the is-7, type 61, and the t62a. I think the tier 9 and 10 japanese meds and tier 9 and 10 russian tanks have this issue
Aslains_WoT_Logs.zip
I have the engine sound mod checked for your latest modpack. There is no engine sound for the type 61 or is-7. The sounds work for the other tanks though. I think just the diesel engine tanks have that problem
Aslains_WoT_Logs.zip