Go Back   The 75 and ZT Owners Club Forums > The 75 and ZT Owners Club Forums > Technical Help Forum
Register FAQ Image Gallery Members List Calendar Search Today's Posts Mark Forums Read
Notices

Reply
 
Thread Tools Display Modes
Old 16th April 2019, 15:21   #11
T-Cut
This is my second home
 
Rover75 and Mreg Corsa.

Join Date: Nov 2006
Location: Sumweer onat mote o'dust (Sagin)
Posts: 20,090
Thanks: 218
Thanked 2,842 Times in 2,330 Posts
Default

Quote:
Originally Posted by spencer burrows View Post
when coldish i bleed the system by taking top off header tank and revving and observe speed of coolant. is this okay to do?
There's no problem in doing this with the engine cool, but there should be no movement of coolant to assess the pumping speed. It might rise and fall a little with the revs, but there's no visible flow across the tank. The header isn't part of the coolant circuit and stands atop a single pipe tee'd into the lower radiator hose. It doesn't have coolant circulating in/out or across it. Any gurgling from the header is simply air rising up the header pipe as you circulate it with the pump. It not the correct method.

In the 1.8 I've never observed the flow of any coolant from the head vent which enters the neck of the header tank, nor the invisible co-vent hole that's hidden from view. This is so even when revving hard. However, a few owners of the V6 report significant flows from here when revving. They see two streams. Notwithstanding, the small bore pipes involved are for venting air from the head/heads and not for coolant circulation.

Quote:
I have to top up when it throws out the coolant. defo see coolant bubbling out of header cap only after higher revs. then i have to top up. i is not huge amounts and i am not over filling as the line is clear to see in the bottom of header tank.
I assume you mean with the cap off? In any case, it's not the correct way to bleed/top up. You should follow the method described in Haynes and repeatedly on the forum.

If revving the cool engine causes coolant to be ejected when the cap's screwed down it is not a good omen IMO. Something is creating a coolant pressure exceeding 22psi and the pump can't do that.

TC

Last edited by T-Cut; 16th April 2019 at 15:24..
T-Cut is offline   Reply With Quote
Old 16th April 2019, 16:07   #12
TT Tim
Regular poster
 
Rover 75 Tourer

Join Date: Feb 2018
Location: Brook, Ashford, Kent
Posts: 51
Thanks: 12
Thanked 40 Times in 6 Posts
Default

I had a similar problem to the OP, in the end I bought a Vacuum refill kit. I'd highly recommend it if you have a compressor big enough to handle it.

Like this
TT Tim is offline   Reply With Quote
Old 18th April 2019, 20:00   #13
dekhelia
Regular poster
 
75 Saloon

Join Date: Dec 2013
Location: York
Posts: 77
Thanks: 6
Thanked 11 Times in 7 Posts
Default

Quote:
Originally Posted by spencer burrows View Post
when coldish i bleed the system by taking top off header tank and revving and observe speed of coolant.

There is an actual method of bleeding though, and I'm afraid the above is not it. There will be many descriptions of the recommended bleed method, online and elsewhere, but basically you need to bleed via the nipple on the pipe that runs across the top of the gearbox bellhousing.
dekhelia is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +1. The time now is 21:56.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Copyright © 2006-2019, The Rover 75 & MG ZT Owners Club Ltd