Will Posted 8 hours ago Share Posted 8 hours ago Hi Firstly Does a old 470 etech usually run a little rough at idle? secondly, changed injectors and o rings, EUP o rings all replaced but engine is still putting fuel into the oil. any ideas or thoughts would be very helpful. thanks Quote Link to comment https://www.bigmacktrucks.com/topic/75841-470-etech-98-model/ Share on other sites More sharing options...
0 Joey Mack Posted 7 hours ago Share Posted 7 hours ago There is a fuel gallery plug behind the front cover that can leak. I have posted a few times on this subject. The rough idle may be the pressure regulator. My guess is it idles at 625 rpm's and it surges to about 650. Up and down continuously.. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75841-470-etech-98-model/#findComment-580505 Share on other sites More sharing options...
0 Will Posted 7 hours ago Author Share Posted 7 hours ago I just had front cover off to replace camshaft, didn’t see that one. What does the plug do? yes that’s correct, where abouts is the pressure regulator? Quote Link to comment https://www.bigmacktrucks.com/topic/75841-470-etech-98-model/#findComment-580506 Share on other sites More sharing options...
0 Joey Mack Posted 6 hours ago Share Posted 6 hours ago when the front cover is off, the plugs are over to the left when looking at the front of the engine. they are 1/4'' npt. theres 2 of them. you can see the top one behind the overboard breather, the other is 1 '' below it. . fuel pressure is between 60 and 80 psi, however that year may require a 100 psi regulator. It is found coming out of the block below the #4 eup. yours will be a 45 degree fitting with a #6 braided hose and possibly a 1/4'' plastic return coming off of it. that is the return side of the fuel galleries 2 Quote Link to comment https://www.bigmacktrucks.com/topic/75841-470-etech-98-model/#findComment-580507 Share on other sites More sharing options...
0 Will Posted 6 hours ago Author Share Posted 6 hours ago Ok thanks a lot mate, I’ll have a look at that. Would the regulater be buggered do you think? And could this be the reason it’s blowing a bit of smoke at idle? Quote Link to comment https://www.bigmacktrucks.com/topic/75841-470-etech-98-model/#findComment-580508 Share on other sites More sharing options...
0 Joey Mack Posted 6 hours ago Share Posted 6 hours ago It could be. One way we would check the regulator without a gauge was to squeeze the braided hose with pliers to see if the idle smooths out. Of course if the line is old and stiff, you run the risk of breaking the hose internally.. I expect some disagreement on that last part.. 🍻 Quote Link to comment https://www.bigmacktrucks.com/topic/75841-470-etech-98-model/#findComment-580509 Share on other sites More sharing options...
0 Will Posted 5 hours ago Author Share Posted 5 hours ago Thanks for your help mate Quote Link to comment https://www.bigmacktrucks.com/topic/75841-470-etech-98-model/#findComment-580510 Share on other sites More sharing options...
0 Joey Mack Posted 5 hours ago Share Posted 5 hours ago your welcome. Good luck Quote Link to comment https://www.bigmacktrucks.com/topic/75841-470-etech-98-model/#findComment-580511 Share on other sites More sharing options...
Question
Will
Hi
Firstly Does a old 470 etech usually run a little rough at idle?
secondly, changed injectors and o rings, EUP o rings all replaced but engine is still putting fuel into the oil.
any ideas or thoughts would be very helpful.
thanks
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https://www.bigmacktrucks.com/topic/75841-470-etech-98-model/Share on other sites
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