Hydraulic lifters Stuck? Bad?

Ok. This is what I have come up with so far on how to test whether a particular lifter is good or bad.

1)If the lifter is solid/stuck - Dismantle and clean all the parts of the lifter and put it back together. Dip in oil and pump the top plunger two three times. If the lifter is good then it should go solid with no squishy movement. If still squishy after pumping dipped in oil then it's bad.

2)If the lifter is squishy - Dip in oil and pump the top plunger two three times. If the lifter is good then it should go solid with no squishy movement. If still squishy after pumping dipped in oil then it's bad.

3)Also check the lifter crown to ensure it is slightly convex. If it's flat, then the lifter needs replacing.

mmm from memory the Isuzu ones go rock hard and don't bleed down when new . That was in the v6 ones . There was only a problem if the oil was not looked after . We used to pull them apart and clean them with thinners and wipe them with fine scotch bright .
assemble them with light oil like sewing machine oil . Some I even put in the ultra-sonic cleaner. for the day . they like nice clean and thin oil ! hope t5his helps

This is interesting and useful stuff.

Cam lobe wear and lifter crown wear need to be taken into account to assess whether they are good or bad. I've been learning how important these things are for the proper performance of the engine. I missed out on proper inspection of the camshaft lobes and particularly the lifter wear on the lifter crown. I'll have to do it soon. :)

I gathered below articles about cam lobe wear and the symptoms & diagnosis.

How To Check Flat-Tappet Lifter Crown, Lobe Taper, And Lifter Bores - Hot Rod Network

https://itstillruns.com/eliminate-en...e-7625574.html

Guide to Camshaft Technology - Tech Article - Chevy High Performance Magazine

cam wear,articles you need to read | Grumpys Performance Garage

1996 Bronco/F-Series

https://www.slideshare.net/rajat_jubilee/cams-29473456

https://archive.cnx.org/contents/8c6...99fb8d9@1/cams

https://forum.miata.net/vb/showthread.php?t=564488

154 9901 02 O+154 9901 Jeep Bumpstick Basics+cam Lobe And Lifter Diagram - Photo 30784513 - Choosing The Best Cam For Your Jeep

And below pictures demonstrate cam lobe/hydraulic lifter issues.

It is NOT my camshaft, but random pictures I pasted from google.

http://www.nissanpatrol.com.au/forum...2017/10/88.jpg
http://www.nissanpatrol.com.au/forum...2017/10/89.jpg
http://www.nissanpatrol.com.au/forum...2017/10/90.jpg
http://www.nissanpatrol.com.au/forum...2017/10/91.jpg
http://www.nissanpatrol.com.au/forum...2017/10/1.html

what ever you do dom. NEVER PUT A USED LIFTER ON A DIFFERENT CAM LOBE. unless the new lifter was run in to the particular lobe never ever swap them around or you will destroy the cam lobe, flat tappet lifters will surface harden as they run in agains a particular cam lobe swapping the lobe a lifter runs on is a sure fire way to wape a lobe off the cam.

http://www.cranecams.com.au/pdfs/Rea...%20Failure.pdf


and you must go through a break in procedure when fitting new lifters even on a used cam

http://www.cranecams.com.au/pdfs/CAM...0PROCEDURE.pdf




the only lifters that can be swapped around etc are roller lifters

Quote:

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Originally Posted by billyj

what ever you do dom. NEVER PUT A USED LIFTER ON A DIFFERENT CAM LOBE. unless the new lifter was run in to the particular lobe never ever swap them around or you will destroy the cam lobe, flat tappet lifters will surface harden as they run in agains a particular cam lobe swapping the lobe a lifter runs on is a sure fire way to wape a lobe off the cam.

http://www.cranecams.com.au/pdfs/Rea...%20Failure.pdf


and you must go through a break in procedure when fitting new lifters even on a used cam

http://www.cranecams.com.au/pdfs/CAM...0PROCEDURE.pdf




the only lifters that can be swapped around etc are roller lifters

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Cool, thanx mate. I didn't swap them. I had a vague memory Haynes manual advising not to do that as well.
I learnt a fair bit about hydraulic lifters & cams in one day. :D
I was contemplating on doing something dodgy like turning the lifter head into a convex one by grinding and polishing, but I won't. ;)

I bumped into a bastard of a problem today when I realize I couldn't get the cam gear in with the timing belt attached.
The extra thickness from the better cylinder head & new gasket made it impossible.
I have to pull the timing cover, fan, shroud, harmonic balancer etc to access the damn timing belt tensioner to loosen it up a bit
to get the cam gear into the slot. What a bummer. It ate my whole evening.:1087:

I have a bit of hydraulic lifter noise from the front of the engine.

I gathered below links that sort of explains hydraulic lifter noise & how to locate & diagnose them while they are fitted to the car.


https://itstillruns.com/causes-lifte...-12216682.html

http://www.hotrodders.com/forum/how-...er-136820.html

http://www.passatworld.com/forums/b5...ifter-bad.html

Thanks Dom. Gravedig but I think this may be my problem. Hope you are well mate, has been a long time.

Unfortunately, Dom will probably not be back. It was sad to watch the turn of events that caused him to leave.