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Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW MKIII-A3/B4 TDIs

VW MKIII-A3/B4 TDIs This is a discussion about MKIII-A3/MkIII Jetta/Golf (<99.5) and B4 Passats (96,97) TDI's. Non TDI related postings will be moved or removed.

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Old May 8th, 2016, 05:35   #1
jjbendo
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Default Rod knock

Hi Everyone!

On my 1996 Passat TDI 5-Sp, 185,000 miles I have what sounds like the beginning of a rod knock.

I am not driving the car. I plan to inspect the Rod bearings and replace them.

Besides having fresh rod bearing on hand what else will I need?
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Old May 8th, 2016, 07:37   #2
JETaah
 
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Connecting rod bolts...they are one-time use.
You need to find out why you have a rod knock at 185K... i.e. oil pump, Faulty piston sprayers.
How do the cam/bearings look?
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Old May 8th, 2016, 20:09   #3
vanbcguy
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Dodgy injectors can make some really nasty noises which sound a lot like mechanical problems - the usual troubleshooting is to run the engine and loosen each injector line one by one - when you break the seal between the hardline and the injector it will no longer build enough pressure to pop. If the noise gives away with one injector in particular you know where to look.

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Old May 8th, 2016, 20:43   #4
john.jackson9213
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Quote:
Originally Posted by jjbendo View Post
Hi Everyone!

On my 1996 Passat TDI 5-Sp, 185,000 miles I have what sounds like the beginning of a rod knock.

I am not driving the car. I plan to inspect the Rod bearings and replace them.

Besides having fresh rod bearing on hand what else will I need?
How about some plastigauge to measure your rod bearing clearances?

I pulled and measured rod bearing clearances on a 1Z engine with 285K miles last year. Rod bearings were still within factory specs. I simply replaced with new, check clearance, used new rod bolts (you have to use new bolts).

At 185K, if you need to replace the rod bearings, best you know what went wrong - or you may be doing the job again real soon. Or worse.
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Old May 11th, 2016, 08:10   #5
jjbendo
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Thanks everyone.
I will investigate and report back.
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Old May 11th, 2016, 17:58   #6
ToddA1
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I'd check the injectors first. The cost of stretch bolts for the lower end, add up quickly.

-Todd
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Old September 9th, 2019, 18:58   #7
antonio2001
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https://youtu.be/Kcp3hohnXok

Does that sound like rod knock.?
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Old September 9th, 2019, 20:04   #8
Mongler98
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Quote:
Originally Posted by antonio2001 View Post
https://youtu.be/Kcp3hohnXok

Does that sound like rod knock.?
really hard to tell from inside. i hear it but does it change with RPM?
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Old September 10th, 2019, 03:58   #9
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3 1/2 year old thread.
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Old September 10th, 2019, 05:10   #10
Mongler98
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Not the post I responded to
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Old September 11th, 2019, 17:04   #11
antonio2001
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Kind of.. its werid seems to do it a few seconds after i let off throttle then stops. And yeah seems to generally folow rpms
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Old September 11th, 2019, 17:55   #12
Mongler98
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check under the valve cover for any spider cracks or any odd wear on either the cam and or the lifters (directly under the cam. if it looks nice and cleanly worn its fine
ever run low or out of oil? check oil pressure with a gauge
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Old September 11th, 2019, 20:50   #13
antonio2001
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Lifters are new . (60 000km) from INA but with a used cam from another engine. But i doubt its that. Oil pressure is good. 22 psi idle hot. Goes up nice and fast with throttle. Any other ideas off the hat?
Thanks
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Old September 11th, 2019, 20:55   #14
Mongler98
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Used cam with new lifters? I bet you that's the problem . You need them both to be new or resurfaced. You will kill lifters and a cam if you mix match them even of they are good. Did you at least run zink for a few hundred miles?
Also where exactly did you get the liftes, there are bad ones and good ones. Frank06 is who you want to talk about lifters. There are threads about this. Who did the work.
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Old September 12th, 2019, 05:59   #15
antonio2001
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Theyre ina lifters. Good stuff. I did the work. And i inspected under valve cover this mor i g. Clean as hell
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