Testing LDA on a 16TD

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slippy8v
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Joined: 03 Jun 2013, 19:18
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Location: Ballyclare Northern Ireland

Testing LDA on a 16TD

Post by slippy8v »

Just a quick tip for testing your you LDA if your running 16 TD. I had put a new fan belt on my syncro last week and then started the van up, gave the engine a rev using the lever on the pump and noticed the LDA arm was not moving. So after some head scratching and the thought of spending £180 on a new one I thought I should try and test it, after bit of online searching, I hit on the idea of using a bike pump with the clamp on end, so clamped it on pumped up and LDA working as it should and holding pressure so looks like the hose feeding it may be goosed. Yes you can also move the arm out then put your finger over the small pipe on the LDA to see if it holds the pin out. 


https://youtu.be/qH3noOW_-rs
 
Last edited by slippy8v on 02 Feb 2021, 16:57, edited 1 time in total.
1967 RHD WALKTHROUGH SPLITSCREEN
1971 RHD BAY
1993 MK1 GTI CABBY RIVAGE
1989 T25 KOMET
1991 T25 SYNCRO PANEL VAN

Dueller
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Re: Testing LDA on a 16TD

Post by Dueller »

Thats awesome, will try this on mine as ive only a vac pump and been wondering how to modify it to push instead

I have sucked on the hose and it held pressure so not the diaphragm, thinking much lubrication next
1989 Crewcab 1600TD JX
4 Speed

slippy8v
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Joined: 03 Jun 2013, 19:18
80-90 Mem No: 8868
Location: Ballyclare Northern Ireland

Re: Testing LDA on a 16TD

Post by slippy8v »

I know you can move the lever forward and put your finger over the hose inlet on the LDA if is good the arm should not move until you lift your finger, but this way at least I know for sure its OK 
1967 RHD WALKTHROUGH SPLITSCREEN
1971 RHD BAY
1993 MK1 GTI CABBY RIVAGE
1989 T25 KOMET
1991 T25 SYNCRO PANEL VAN

slippy8v
Posts: 787
Joined: 03 Jun 2013, 19:18
80-90 Mem No: 8868
Location: Ballyclare Northern Ireland

Re: Testing LDA on a 16TD

Post by slippy8v »

noticed a small leak on the LDA shaft so ordered up a new seal from Brickwerks looks like it needed changed 
Image
1967 RHD WALKTHROUGH SPLITSCREEN
1971 RHD BAY
1993 MK1 GTI CABBY RIVAGE
1989 T25 KOMET
1991 T25 SYNCRO PANEL VAN

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HarryMann
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Re: Testing LDA on a 16TD

Post by HarryMann »

Do not expect the LDA to do much or indeed any movement just by revving in neutral. Little or no boost is produced because the engine isn’t working hard at all (loaded up).

Good tip though and although a fair bit of work be aware that a diaphragm repair kit can be bought from a man in Germany for I forget what... £30 ?

So in the spirit of a fair exchange... check your fan/aux belts as broken or slipping belt on a JX, no water circulation

This looked OK till removed and turned inside out. Eeeek 😒 (the missing chunk damage must’ve been under the main crank pulley)

NB Check these belts regularly and closely. If they keep losing tension suspect poor quality belt, old perished/aged belt or trouble with the alternator pivot bolt or tensioning bar. Lastly when belt loose or off give the alt and wpump pulleys a spin and a wiggle to check bearings.

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