home register FAQ memberlist calendar

Go Back   Turbobricks Forums > Mechanical > projects & restorations

Reply
 
Thread Tools Display Modes
Old 04-19-2021, 04:55 PM   #76
Swedbrick
Board Member
 
Swedbrick's Avatar
 
Join Date: Oct 2016
Location: Netherlands, Source of Grolsch
Default

Quote:
Originally Posted by esmth View Post
wow thanks, I really appreciate it but i have already implemented it in 8051 assembly for an at89lp52 mcu for practice.
That's rad, I've had to learn 8051 assembly for my engineering courses, but never implemented something with it!
__________________
Volvo 745 - IPD springs, 25mm/19mm swaybars, T-cam, LH2.4, M90 swap, 3.54 \w racingdiff lsd, track/daily
---------------------------------
I sell LH2.4 Chips for Europe!
Swedbrick is offline   Reply With Quote
Old 05-17-2021, 09:59 AM   #77
esmth
Board Member
 
Join Date: Jul 2016
Location: MA/NH
Default

i am hackerman



this is my new home


Scored some mint seats from a 90 240!



The driver side wheel bearing all of the sudden got very noisey. it was amplified by the solid strut mounts and i made it about 2 days before it drove me crazy to fix it.




It looks like the rear seal plate somehow worked its way out and m******* salt marsh water washed all the grease out. Luckily I caught it before it welded itself to the spindle



I haven't checked the valve lash for 60-80k so I got that over with. I don't know what I was thinking before but one of my valves was at 0.28mm and others were at 0.53mm. I could have sworn I did it perfectly last time. whatever, its fixed now, with all of them at 0.33mm to 0.34mm. A little tight for the spec but it's fine.



I also did the hushers as I didn't touch them last time. They all were hard as a rock and shattered as I extracted them. I also have a sneaking suspicion that they are indeed directly correlated with the knock sensor and ezk pulling all the timing it can on hard pulls, as that stopped happening once I replaced these and fixed the lash.



While doing the lash, I noticed how worn my timing belt and gear were. Probably 1 or 2 degrees of play of the belt on the gear.


I ordered a new belt and on a lazy friday night with nothing to do I played around with the cam timing and did some highway pulls. I ranged it from -6 to +6 degrees and after ~200 miles i figured +2 felt all around the best. But with the play, who knows what it was actually at.


this doesnt look right


I did a round tooth belt conversion as I had the parts from spare motor. I also used the cam gear plates from my 398 head.

Wow this thing got chewed up!

the lines on the belt don't even line up!

I ended up taking the cam gear plates off because the belt was proving difficult to get on. Once I re tension it in 1000 miles or so I'll try reinstalling them. The round teeth are definitely quieter as they say. Less of a slight whine that was prevalent when the worn belt was tensioned.


I ordered a smaller alternator pulley to get better charging at idle but it is too far off in multiple dimensions to use without modification. It needs the bottom step and the back side of the pulley turned down maybe 2mm to line up right. It also drags against the alternator housing. I'll see if I can use my friends lathe to fix it myself.



My mann pro vent keeps clogging up so I relocated it to next to the radiator for more heat. It also had the side effect of a more straight shot for the drain into an oil quart bottle. It was snaking around the strut tower before.




i will never get rid of this car. i love it
__________________
1991 244 LH2.4 M46 360k miles
esmth is offline   Reply With Quote
Old 05-17-2021, 10:59 AM   #78
Cwazywazy
Single jingle
 
Cwazywazy's Avatar
 
Join Date: Aug 2016
Location: Granby CT
Default

round tooth and topcog gang
__________________
I don't know what I have
Cwazywazy is offline   Reply With Quote
Old 07-12-2021, 11:28 AM   #79
esmth
Board Member
 
Join Date: Jul 2016
Location: MA/NH
Default

my diff has been making scary noises for a little bit. I changed the fluid a couple of times as seen in the history of this thread. This pic is a comparison from 2 week old oil vs brand new oil. The dark stuff in the oil is not metallic, the magnet collects nothing substantial.






The noise is the worst at like 50-80% on throttle. I hear nothing on decel/coast. I am not 100% sure about noise at WOT because my exhaust is obnoxious. (i'm working on that, lol)



opinions? probably 400k+ miles on the diff.

Last edited by esmth; 07-12-2021 at 11:44 AM..
esmth is offline   Reply With Quote
Old 07-12-2021, 11:42 AM   #80
esmth
Board Member
 
Join Date: Jul 2016
Location: MA/NH
Default

Ok so I scanned thru this thread for the first time in a little bit and I recall during my spartan locker install 1.5 years ago (which is still working beautifully, BTW) I had to cut out the weird bolt retainer/oil slinger to get the ring gear bolts out. It was pressed in between the bearing and the carrier. I am thinking the carrier bearing may have shifted slightly with this removed affecting the backlash? Maybe this thing is a requirement for correct oiling? I put 60k+ miles on this thing since the install.



esmth is offline   Reply With Quote
Old 07-12-2021, 12:34 PM   #81
Swedbrick
Board Member
 
Swedbrick's Avatar
 
Join Date: Oct 2016
Location: Netherlands, Source of Grolsch
Default

I've cut that thing on 2 diffs, and never had any issues, I would doubt it would clamp on the bearing stop. Thin sheet metal would deform between the hardened surfaces over time, and when pressing it together.

Those bearings however look pretty worn compared to mine, so that might be your issue, here's mine for comparison, a second stop appears to hold the bearing. Both sides have the same gap:
Swedbrick is offline   Reply With Quote
Old 07-12-2021, 02:31 PM   #82
esmth
Board Member
 
Join Date: Jul 2016
Location: MA/NH
Default

I do vaguely recall seeing a step on the carrier itself the bearing seated against but I just wanted to be sure! thx for the pix.

I looked through my photo album and couldn't find any better images of the carrier bearings. In person though they looked fine. (1.5 years ago) No pitting or major discoloration but with this many miles their time is probably up.

Does the sound in the video remind you of any specific failure in mind? People on other forums seem to claim different failure modes can produce different sounds. If it's just carrier bearings I can bang those out in a weekend. But the pinion bearing work is new to me.
esmth is offline   Reply With Quote
Old 07-12-2021, 03:40 PM   #83
Swedbrick
Board Member
 
Swedbrick's Avatar
 
Join Date: Oct 2016
Location: Netherlands, Source of Grolsch
Default

The noise it makes does not sound like backlash to me, that is more of a whine on acceleration and decelleration. I recall my locker sometimes being slightly rattely, but also mostly on decel and roundabouts. I have heard that the engagement of the locker can start to wear out over time (2-3years), does it give the sense of locking up less firmly?

Following this guide it might just be the bearings on the carrier, since it is not that high pitched and rumbly from what I could tell, as the pinion moves a lot faster
https://fuelandfriction.com/weekend-...rential-noise/
Swedbrick 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 On

Forum Jump


All times are GMT -4. The time now is 02:11 AM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.