SU HIF 4 Carburetor Rebuild / Reassembly / Adjustment

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4 жыл бұрын

I haven't seen much in the way of step by step instructions or video tutorials for rebuilding SU HIF 4 carburetors so I decided to make one. If you'll pardon the iffy video quality and my occasionally annoying commentary there's probably some useful information in here somewhere.
In this video I also go over adjusting float height and initial carburetor main jet settings. Sorry it's so long!

Пікірлер: 46

@johncoen7416 28 күн бұрын

Excellent video. A clear step by step explanation of the rebuild process. Thank you. I feel more confident now tackling the job. FYI, the official MGB shop manual says dash pot oil should be 20 weight motor oil. Also describes how determine the correct amount.

@twistynobbly Жыл бұрын

Just bought a 1975 B GT with these carb's fitted. 50+ years of BMC cars and this is the first time I have come across these particular HIF4 units. Great video. Thanks for your time.

@danielwoodard680 4 жыл бұрын

thank you for publishing this video. i will be confident that I can rebuild my carbs this week.

@jackrobson2553 3 жыл бұрын

Mate, thank you for doing this video! I appreciate your generosity in sharing your expertise.

@E-Z-O 2 жыл бұрын

Thank you so much these video series have been an absolute Godsend

@ceesschot3711 3 жыл бұрын

More instructive then any formel MG site. Thank you for publishing this easy to follow video.

@johncouch9359 2 жыл бұрын

That was a huge help for me. I rebuilt and had high idle and idle screw wasn't touching the stop. Your video pointed out the cause being the groove needed in the new plate. Very well done and very helpful. Thanks for all the tips.

@martinhayles1999 10 ай бұрын

AWESOME video. Wish I had seen it before rebuilding my carbs. I may partially re-d o them as I think slight tweaks via the video will help correct high idle speed

@henriksrestorations 2 жыл бұрын

Awesome mate! Seems like I messed up my carbs so need to take them apart again. Will use this vid as a tutorial! :)

@mattkilbourne4654 Жыл бұрын

Cant thank you enough for this video. Absolutely well done. Only thing I would add: Where to set the collar when setting the jet needle in the piston. (ANSWER: The surface of the collar should be level w the bottom surface of the piston. I had to dig around the internet for that. :) ).

@MyMGBJourney Жыл бұрын

I could’ve sworn I put that in there, but thanks for pointing it out!

@BUILTOFFICIAL 3 жыл бұрын

this just saved me! Thanks so much bro!

@benmarsden7655 2 жыл бұрын

Excellent video! Thank you

@jamesrickwood6333 8 ай бұрын

Great video

@brianmac8260 Жыл бұрын

Mine's been in the garage for winter, carbs on the kitchen table. Hopefully I get it right this time. Thanks again.

@ppeterson9359 Жыл бұрын

Excellent video, thank you. One small correction, the enrichment fuel is actually introduced just downstream of the bridge. The hole under the throttle plate notch is for part throttle operation. I understand the smaller area results in higher velocity and better atomization.

@MyMGBJourney Жыл бұрын

Thanks for the info! It's definitely an odd design compared to "traditional" carburetors' choke mechanisms.

@hansbeelsvanheemstede6780 3 жыл бұрын

Well done! Good and clear Explanation. Pictures are a little to dark though, especially in the close ups (gap of the needle holder to the bridge)

@mow6680 4 жыл бұрын

Excellent tutorial! Been doing this stuff for 45+years. ASE Master for 35+. Only thing I do differently is using Silicone lube instead of oil.

@wallisparnell4464 10 ай бұрын

The thicker the oil in damper, affects response. Thinner oil have to replace more often, faster response , yes true.

@stevetong1576 2 жыл бұрын

Great video many thanks - have you ever tried tomato ketchup and aluminium foil to clean up brass? Slather on the ketchup and clean off with scrunched up foil. Brings it right up and softer than sand/emery paper. Try it on your door knob!

@MyMGBJourney 2 жыл бұрын

Thanks! Most of the brass pieces come new with the rebuild kit. I can't think of any off the top of my head that would need to be refreshed on the carbs. Not visible ones anyway.

@alagregg 4 жыл бұрын

A quick question about the Choke Spindle, as shown at 10:05 of this video. On the left of it (as shown on screen), theres a captive steel washer. Should this washer rotate freely against the rest of the spindle ? Or does it stay stationary in relation to the spindle ?. My washer moves, but not freely (I can't tell wether it should or not) The washer is rusty on my part and I'm considering replacing the whole spindle (as this washer is captive). I'd be grateful for any advice.

@MyMGBJourney 4 жыл бұрын

If I recall correctly, that just centers it in the bore and wouldn't necessarily have to spin freely as long as the whole unit could still turn in the carburetor body.

@TomShorrock 3 жыл бұрын

hey dude! awesome video! where did you get the rebuild kit from ?

@MyMGBJourney 3 жыл бұрын

The parts came from sucarb.co.uk/ and it was worth the wait! Cheaper than the US based suppliers and a more comprehensive parts list. The website is a bit difficult to navigate, but the parts were great! You can even get the sold throttle disks (without the valves) and the stay-up floats if you want!

@briantilley4825 Жыл бұрын

hi MIKE do you re builld hif su you make it look easy.find parts are hard to purchase in NZ.

@MyMGBJourney Жыл бұрын

I’m in the US and still ordered my parts from the UK! It didn’t take too long to get them in the states, but NZ might be a different animal.

@wallisparnell4464 2 жыл бұрын

Where did you get this kits from? Ooppss, vinegar will attack aluminum big time, I say no way! My older MGA cards I broke down SUs and used Dawn in a pan of hot water, let soak a few hours, looked brand new.

@MyMGBJourney 2 жыл бұрын

The kits came from sucarb.co.uk as this ended up being cheaper than any local suppliers and really didn't take that long to get in. In retrospect, I would have looked a little harder for the kit that included throttle blades with no poppet valve in them. I haven't watched my own video in a while, but I don't believe I used vinegar for anything on my carburetor.

@alagregg 3 жыл бұрын

My rebuild kit had both large and small spindle seals. six small and four large. Looking at the other carb (which I hadn't stripped down), the choke used the small seal. I assume the throttle spindles use the larger seals. Although I can't work out why I've got six of the smaller ones!. If I understand it all by the end, I'll post something here.

@MyMGBJourney 3 жыл бұрын

My kit had extra throttle shaft seals as well.

@alagregg 3 жыл бұрын

@@MyMGBJourneyThe larger seals are 'improved' throttle seals. Which can be used in addition to (or instead ?), of the smaller seals. Hopefully this information avoids somebody getting confused like I did. Thanks for the help :)

@MyMGBJourney 3 жыл бұрын

alagregg that’s good to know! They looked close enough to me and the ones I grabbed fit perfectly first time. I’ll just save the other ones in case I need to reseal it later.

@wallisparnell4464 2 жыл бұрын

#0000 steel wool is great for cleaning polishing these parts.

@briantilley4825 2 жыл бұрын

HI WHATS WITH THE 2 coloured fuel pick up

@MyMGBJourney 2 жыл бұрын

My assumption is to give some distinction between left and right. It's been a while, but if I remember correctly there wasn't anything that specifically said which was which if that was the case.

@kieranmurphy6633 3 жыл бұрын

Is there a part three to this ?

@MyMGBJourney 3 жыл бұрын

I installed the carburetors back on the car before I got a good shot of the linkage. It all went together pretty straight forward. If you let me know what you're looking for I can definitely make a Part 3!

@kieranmurphy6633 3 жыл бұрын

@@MyMGBJourney Exactly what you described there how the linkage all comes together.....please