rallytwo Posted July 24, 2020 Report Posted July 24, 2020 Looking for resources to purchase OEM or equivalent match/quality thermostat housing that is smog pump compatible. If anyone has any suggestions, let me know. There are 2 on ebay..... one looks like the exact fit for $85 but not smog pump compatible. The other is $95 and smog pump compatible but doesn't look like an exact match to mine. Unfortunately, I broke one of the bolts when taking the thermostat cover off to replace bad thermostat. Thanks for any help! Rob Quote
datzenmike Posted July 24, 2020 Report Posted July 24, 2020 I don't think there is anything on any of the L thermostat housings related to the air pump. Got a picture of this 'smog pump compatible' housing??? 1 Quote
john510 Posted July 24, 2020 Report Posted July 24, 2020 What Mike says.Nothing on the thermostat housing is related to the smog pump.I've had five 510's through the years and nothing about the pump and thermostat housing are related. Quote
datzenmike Posted July 24, 2020 Report Posted July 24, 2020 I would fix the old one rather than trying to unbolt the old housing. The bolts into the head tend to break off too.... but that's me. Heat housing with torch, aluminum expands twice as much as steel. There were two distinct housings, one with a two bolt thermostat cover and '79 and up that had 3 bolts. Obviously a two bolt won't fit a three bolt housing so be sure to get a matched pair. The later L20B have a by pass fitting and a TVV (thermal vacuum valve) for the EGR. Both holes can be plugged easily enough. Here's a TVV replaced with a plug Quote
KELMO Posted July 25, 2020 Report Posted July 25, 2020 Still available from your local Nissan dealer. Quote
yenpit Posted August 17, 2020 Report Posted August 17, 2020 Correct, the 510 only had one style of thermo housing. The 510 had the factory temp gauge sensor on the front facing the radiator & a coolant passage nipple on the side facing the drivers side inner fender. There are numerous other L series thermo housings, for the L20B & the 6cyl L series, with multiple threaded holes for additional sensors etc that the 510 never had. All L series thermo housings will bolt up. Only reason to use a different housing is if you want to add a sensor ie electric fan etc. Quote
banzai510(hainz) Posted August 22, 2020 Report Posted August 22, 2020 (edited) 510 had 2 one with a bypass to the hot water line(a splice) was a U shaped Hose, the one in your PHOTO. 11061-p300 the other didn't have the water line splice. So NO threaded hole. water line came direct from under the fuel pump 11061-2100 these are old part numbers but one can see if still good Edited August 22, 2020 by banzai510(hainz) Quote
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