https://www.hbrperformance.co.nz/tech daily 0.75 2025-05-29 https://www.hbrperformance.co.nz/tech/2025/4/9/gen-iv-ls-timing-chain-tensioner-failure monthly 0.5 2025-05-29 https://images.squarespace-cdn.com/content/v1/5c5a12e5f4755a467c04f68c/67acaafc-8eb9-499f-93d8-69758d6dd639/LS3+Timing+Chain+Tensioner+Failure+Oil+Pickup Tech - Gen IV LS Timing Chain Tensioner Failure - Make it stand out Having fallen into the chain path, debris from the broken nylon timing chain guide is sucked into the oil pump pickup causing blockage and oil starvation. https://images.squarespace-cdn.com/content/v1/5c5a12e5f4755a467c04f68c/eb7d6280-466e-4b1e-8eed-7681950431ef/LS3+timing+chain+tensioner.jpeg Tech - Gen IV LS Timing Chain Tensioner Failure - Make it stand out A broken timing chain tensioner, showing the snapped nylon guide and loose spring steel. https://images.squarespace-cdn.com/content/v1/5c5a12e5f4755a467c04f68c/1748507811952-XRTJOM63533GLE3UEJSG/LS3+tensioner++and+LS2+damper+comparison Tech - Gen IV LS Timing Chain Tensioner Failure - Make it stand out The OEM LS3 tensioner (top) is prone to failure. HBR recommends replacing it with the OEM LS2 damper (bottom). https://images.squarespace-cdn.com/content/v1/5c5a12e5f4755a467c04f68c/1748507884297-VMJZED41BGKIGA2HYZ63/387.jpg Tech - Gen IV LS Timing Chain Tensioner Failure - Gen IV LS OEM Timing Chain Tenioner OEM installed tensioner assembly. https://images.squarespace-cdn.com/content/v1/5c5a12e5f4755a467c04f68c/1748507816569-SI798B8RSU8W04E8H431/389.jpeg Tech - Gen IV LS Timing Chain Tensioner Failure - Gen IV LS Block With No Tensioner Gen III engines had no tensioner fitted from the factory, although there was is still provision (internal threads) for retrofitting the LS2 damper in all but the earliest blocks. https://images.squarespace-cdn.com/content/v1/5c5a12e5f4755a467c04f68c/1748507817758-5LBUJ2V205917P0X5QOM/390.jpeg Tech - Gen IV LS Timing Chain Tensioner Failure - Gen IV LS With LS2 Timing Chain Damper The LS2 timing chain damper is a reliable solution, restricting the chains freedom of movement while having no risk of failure. https://images.squarespace-cdn.com/content/v1/5c5a12e5f4755a467c04f68c/1748507811952-XRTJOM63533GLE3UEJSG/388.jpeg Tech - Gen IV LS Timing Chain Tensioner Failure - LS3 Tensioner (top) - LS2 Damper (bottom) Uninstalled view of both tensioner and damper parts. https://images.squarespace-cdn.com/content/v1/5c5a12e5f4755a467c04f68c/1748507820742-Y27UYYK1JZH396LPXOY7/392.jpeg Tech - Gen IV LS Timing Chain Tensioner Failure https://images.squarespace-cdn.com/content/v1/5c5a12e5f4755a467c04f68c/1748507823757-UKBP37ATFIBN57DF8QBG/544.jpeg Tech - Gen IV LS Timing Chain Tensioner Failure - Tensioner Failure Common result of tensioner failure in Gen IV LS engines. The broken parts fall into the sump where they can become lodged in the oil pump pickup restricting flow. https://images.squarespace-cdn.com/content/v1/5c5a12e5f4755a467c04f68c/1748507825959-1PD55FPBUWJJCNF774V8/792.jpeg Tech - Gen IV LS Timing Chain Tensioner Failure - LS3 Tensioner Failure The nylon section has broken and released the spring steel into the moving chain and gears. https://images.squarespace-cdn.com/content/v1/5c5a12e5f4755a467c04f68c/1748507828011-FXFP99JPEDCW3PKDQDTS/IMG_2315.jpeg Tech - Gen IV LS Timing Chain Tensioner Failure - LS3 Tensioner Failure The oil pump screen/pickup is blocked by pieces of timing chain tensioner that have fallen into the path of moving engine parts. https://www.hbrperformance.co.nz/tech/2025/4/1/gen-iv-ls-timing-chain-tensioner-failure monthly 0.5 2025-05-29 https://images.squarespace-cdn.com/content/v1/5c5a12e5f4755a467c04f68c/1030515d-f16e-4f0e-a575-fed65e976fbe/LSA+engine+block+oil+squirter+gallery+.jpeg Tech - LSA Piston Oil Squirters - Make it stand out An LSA block with the oil squirters removed. The squirters are tapped into the lifter oil galleries on each side of the block. https://images.squarespace-cdn.com/content/v1/5c5a12e5f4755a467c04f68c/8c3e593e-7ff2-47a3-bebd-0e75190fd2ab/LSA+LS9+engine+piston+oil+squirter.jpg Tech - LSA Piston Oil Squirters - Make it stand out A disassembled OEM piston engine oil squirter. Note the banjo type fitting, o-ring gland, and oil passage through the thread/shank. Each squirter has an internal check valve set at ~40 psi to prevent oil pressure drop at low rpm. https://www.hbrperformance.co.nz/home daily 1.0 2025-06-12 https://images.squarespace-cdn.com/content/v1/5c5a12e5f4755a467c04f68c/1553725862016-31Y45H5DOFHTSOYI5P5I/VF+GTS+Edit+Crop+Adjust.jpg Home - Holden HSV VF GTS Front HBR Holden HSV VF GTS Dyno Tuning and Upgrades https://images.squarespace-cdn.com/content/v1/5c5a12e5f4755a467c04f68c/1554244275029-G8D59T1Y0LG1K5P09IVH/VTII+VZ+Harrop+High+Performance+Diff+Hat.jpg Home - Holden VT VY VZ Harrop Diff Hat Holden VT VY VZ Harrop High Perfomance Diff Hat https://images.squarespace-cdn.com/content/v1/5c5a12e5f4755a467c04f68c/1554251427431-J7MX18BSS2CTF3424F1B/VF+GTS+LSA+Engine+Cover.jpg Home - Holden HSV VF GTS LSA Engine cover Holden HSV VF GTS LSA Engine power upgrades and dyno tuning https://images.squarespace-cdn.com/content/v1/5c5a12e5f4755a467c04f68c/1554252001199-SX06VQJV0VRSTD2K8OQ8/Harrop+VF+GTS+LSA+Supercharger+Pulley+Upgrade.jpg 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