We have a Tennant 6600 sweeper at work (2007 model) with a GM 1.6 Vortec engine.
The engine has once again blown a head gasket. This latest makes the 4th time since the sweeper entered service in 2007.
From what I gather reading around the internet, this engine has a reputation as having "2 year head gaskets", and that sure seems to fit.
Another implication that bears out how poor this engine has performed for people who ended up owning one can be inferred by the fact that GM no longer even produces this engine and also that there are no longer available (so far as we can determine) any complete engines or long block assemblies left in market. It seems that all have been sold already.
Just yesterday I heard through a grapevine that a "fix" for replacing the GM Vortec with a Toyota brand engine has been developed and it is in the form of a retrofit kit.
Have any of you heard of this so called kit fix anywhere?
The person who told me of it yesterday is supposed to furnish me with a contact but I thought I would run it past this board as well as a sort of "verification/validation" thread.