If anybody has extended field experience overhauling early and late production
9 series engines I am needing some clarity on the following:
Some forums make mention of an SB some 10 years ago related to faulty hydraulic
lifters. Is this true? I cannot find any SB on the FlyRotax website.
I am tearing down a 1999 914 with 105hrs TSN. It has Johnson HT-900 (Ford 351
Windsor) lifters fitted. 50% of the lifters are presenting signs of early
failure
at the lobe contact face. There is no EDM oiler port on these units. Were
Johnson lifters ever fitted as OE components on the 9 series engines?
any branding laser etched. The lifters also have an EDM pinhole port in the
center of the lobe contact face. The lobe contact face on some lifters are just
beginning to present troughing. Do genuine Rotax hydraulic lifters still support
an EDM oiling port on the base of the hydraulic lifter?
Did Rotax supplement the current part number for the hydraulic lifter at any
stage?
Any factual industry knowledge is appreciated.
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