wtdash Posted September 17, 2023 Share Posted September 17, 2023 (edited) 2005 OB. Original engine pulled*; installed an EJ251 (no history) with the proper parts from the '05 - Cam and Crank sprockets and IM, etc. Got this noise on the Driver's side: https://youtube.com/shorts/_SV_YqaVGrs?si=RR28wJ05PoxhatR5 and from underneath: https://youtu.be/Kv8IuDBbvFw - I set the valve clearance (on all the valves), which made no difference. - Pulled the injector's wiring on both Driver's side fuel injectors - no difference. Other info. - Drive's OK - power seems normal - for a 2.5. - Get a CEL for P0420 after 2 drive cycles, which I've not diagnosed. Using this for reference: https://www.subaruoutback.org/threads/p0420-diagnosis.49537/ I had a similar noise in a '96 Legacy that turned out to be a stuck piston ring. https://www.ultimatesubaru.org/forum/topic/154755-swapped-out-the-hlas-for-slasstill-got-the-tick/ Is that Rod Knock? Wrist Pin? Stuck Ring(s)? Etc. Thanks for the feedback. * Original EJ253's tensioner bolt broke and caused valve/piston damage. Edited September 17, 2023 by wtdash Quote Link to comment Share on other sites More sharing options...
1 Lucky Texan Posted September 17, 2023 Share Posted September 17, 2023 (edited) does the noise get increasingly aggressive-sounding with increased rpm, or, does it kinda come-and-go ? if the latter, might be a weak tensioner. Edited September 17, 2023 by 1 Lucky Texan 1 Quote Link to comment Share on other sites More sharing options...
wtdash Posted September 22, 2023 Author Share Posted September 22, 2023 (edited) ^Thanks for the reply. It's RPM dependent - cold and warm - it changes w/the idle speed - and isn't any worse sounding when revved - even to 6K. And is concentrated over Cylinder 4 area. Above (in my post) is cold start. Here is the warmed-up: Edited September 22, 2023 by wtdash Quote Link to comment Share on other sites More sharing options...
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