BMW E34 M5 S38 - Individual Throttle Body Restoration

[@mohamedtariq8364]

Great work keep it up bro

[@BadE30]

Thanks 🔥

[@breakaway-e8s]

An interesting video from across the pond. Some notes: Springs should not be plated (you will see the plating flake off with use) For screws the same type was used in Solex carbs The actuator arms which link to the linkage arms (the ones with spherical bearings) are made up of two pieces as you found out. But you should have marked how the two pieces are bolted together as there is an adjustment there. I hope you kept track of which spacer washers go where because they set the axial clearance each side of the each butterfly valve shaft (8 thou). Required due to thermal expansion. I noted you spoke about "thin and thick" ones but there are far more than 2 types involved. If not done you must experiment with them using feeler gauges before peening your butterfly screws. The 3 bearings you used for the main shaft are incorrect, they should be the 2RS version (sealed, FPM material preferable due to temperature) The butterfly valves should be installed while the shaft is still free in its axial movement (so before installing the linkage and nut). You also polished out the witness marks showing exactly where the butterfly was installed prior to disassembly - these are helpful, but the flap position should still be checked in a dark room using a torch, with the butterflys closed as much as permissible (achievable by not snugging down the screws fully and letting the shaft float axially). Also each butterfly should go back where it came from (so position 1 butterfly should not be in position 2 and vice versa)

[@BadE30]

@@breakaway-e8s hi, some great information hear. Now I’m going to be honest, this was one of the first big restoration projects I did and looking back I have many improvements to do now that I am a fully qualified and much more experienced mechanical engineer. Luckily for me, I have a spare set of throttle bodies which I plan to restore where I will take all my experience and make a better job. However most of the things you have mentioned were completed and they are fully functional and within tolerance. But yes due to some errors in dismantling I did mix up the washers and had to swap them until I had it correct.

[@jameshay469]

Very impressive, I love the level of detail and I've really learnt a lot.

[@BadE30]

Appreciate the kind words! I’ve just ordered the last few bits to put the ITB assemblies together, so I’ll be starting that soon and will be making a video.

[@jameshay469]

Excellent, I look forward to it. Subscribed!

[@thedownshiftchannel]

So good!

[@osmanahmed9287]

Hello might have missed it but where did you get the screws from? Im doing the same but on a s38b38

[@ALKUKES]

Where do you buy all the bits? Im about to start same project...

[@BadE30]

I search for all parts and their part numbers on realoem.com, then contact my local BMW dealer (Cotswold BMW) and give the list of numbers. They arrive within a week of payment and you can get 10% discount if you are a member of e30zone.net in the uk!

[@danpratl5289]

@@BadE30 hey there -- where did you find the oem part numbers for the circular brass butterfly throttle pieces, as well as the screws holding them in? I'm on the throttle housing assembly page of realoem for my e34 M5 and cannot find the part number for those screws anywhere (one of mine is a bit stripped). Am I looking in the wrong place?

[@BadE30]

@@danpratl5289 hi, i just cleaned up the butterfly valves and then made my own screws on a lathe using stainless steel hardware, could not find any replacements through bmw

[@danpratl5289]

@@BadE30 ah ok. Yeah those screws are incredibly hard to track down. One last question-those bearings (HK08122RS)-how many total did you need for the three separate throttle pieces? And, are they all the same size?

[@BadE30]

@@danpratl5289 it’s best to make your own, i would not recommend reusing due to the peening them over. There are 6 of the butterfly shaft bearings in total, the linkage shaft bearings are different

[@JONNYFETTBALL]

looks great! where did you buy the bearings? not available through bmw?

[@BadE30]

Not something BMW sell, as they do not offer just the bearings, they only sold the complete units. The bearings are available from any reputable source, they're INA HK08122RS. Hope this helps!

[@JONNYFETTBALL]

Thank you! Keep up the good work

[@BadE30]

@@JONNYFETTBALL Nice one, thanks!

[@danpratl5289]

Do you happen to have the exact names of the tools you used to get the bearings out? I’ve been trying with a number of tools and cannot get any out.

[@BadE30]

www.ebay.co.uk/itm/10x-Inner-Bearing-Puller-Set-Remover-Slide-Hammer-Internal-Kit-9-23mm-Blind-Hole-/193703055175?mkcid=16&mkevt=1&_trksid=p2349624.m46890.l6249&mkrid=710-127635-2958-0 Hope this link works, ‘10x Inner Bearing Puller Set Remover Slide Hammer Internal Kit 9-23mm Blind Hole’. I had to slightly modify the lipped part of the tool for them to fit, but worked perfectly

[@danpratl5289]

@@BadE30 Awesome, thanks man!! Much appreciated.

[@awesomebuildsandrestoratio8143]

really nice result! i did a similar job on an e30 throttle body, but your's belong to a way cooler engine haha. hope u check out my video and let me know what you think. have a great day.

[@JohnDoe-qh6mg]

Do you have a part # on the linkage shaft bearings?

[@BadE30]

All P/N's are in the description!

[@JohnDoe-qh6mg]

@@BadE30 Perhaps they were removed or I am retarded? But I don't see the parts numbers in the description. I ordered the smaller bearings that you listed in the comments. Didn't see the part number for the bigger bearings. Have everything taken apart and on a bench currently

[@BadE30]

@@JohnDoe-qh6mg oops sorry! I thought i had it all covered!! Those linkage shaft bearings are HK1210AS1

[@JohnDoe-qh6mg]

@@BadE30 Thank you so much!!

[@travisthal6880]

Who pressed the bearings for you? I missed that bit.

[@BadE30]

I pressed them in myself, with a threaded bar etc.

[@qivarebil2149]

Why didn't You just plate the carb body?

[@BadE30]

QI Varebil2 I wanted the bodies to stay the original aluminium colour like when new

[@danielg3777]

Can i send you my s38 parts for restoration ?

[@BadE30]

Haha! Unfortunately I take too much time doing my own bits so I don’t have time for anything else for now