okay so here is the QUICK skinney on the polaris style manual tensioners
Back in 2014 we bought a 2014 Polaris rzr xp1000 It had a cold start rattle, I knew the noise right away. Yes Polaris delivered their machines this way. We have a 2015 also that did the same thing, and a 2018 that for some reason does not, all machines use the same Polaris Prostar 999cc 4 valve dohc 4 stroke engine. To my surprise (not really) the timing chain tensioner on the POO POO is the same FORD part! (Cloyes makes them for ford)
Because the Polaris rzr is such a popular machine it has an aftermarket larger then a Jeep, it did not take long for people to discover the hydraulic chain tensioner sucks ass and was causing the chain slap, engine out of time, rattle at cold start. So companies like Boondocker turbo and Sparks racing were first to the scene with a manual tensioner. No more hydraulic pump up, just spring loaded pushing on the chain same tension always. So we tried them in the wifes 2015 4 seat rzr. No more noise. If course I paid $400 for the stainless steel manual tensioner back then because it was so "new" . Now you can get a PAIR of them on Ebay for like $60 LOL
We still have the 2015 xp4k and it has NEVER had the cold start rattle again.
There are two basic types of aftermarket rzr tensioners:
the spring loaded ones with manual adjustment, set the depth, set the lock nut and be done with it
The spring loaded/maybe hydraulic backup tensioned, ratcheting style.
Racheting simply means that once it is set to that depth it can never go back, there is a ratcheting mechanism that holds the tension there and will never let it retract.
You do not need the ratcheting style or the hydaulic tensioned ones, you simply need manual tensioners........ditch the oil pressure run a manually adjusted unit, set it once and forget it.
@allmyEXes is running the maual tensioner in his sohc engine and is pleased so far.......
The Ford parts are $300+ EACH at the dealer.
I would NEVER install a cheaper (Not ford) tensioner into a SOHC engine UNLESS it was an aftermarket manual tensioner.
If I was to own a SOHC engine in my fleet, it would be fitted with manual tensioners. In fact I have a set of the $60 ones downstairs I was going to install in a family members sport trac....but then they went v8 instead, so someday I will get to use those