TTAC Tech Column: BMW Valve Adjustments

by Cary Hubbard

Published: December 16th, 2022

Hi Cary,

I have a question for you about some maintenance on an older BMW I recently bought. The car is an E30 325i and I was told that it needs to have a valve adjustment. I am new to having an older car as everything I have owned prior has been much newer. Any advice on it and what to keep an eye out for?

Thank you for any information.

Ronnie

Ronnie,

Congrats on the purchase of the BMW! Those are really fun cars and overall, pretty reliable. Yes, it is true those engines have solid tappets and need to have regular valve adjustments done on them. That is true for the older inline-six engines M20 and M30 that you find in the 3-, 5-, 6-, and 7-series. If you aren’t getting a small amount of “ticking” from the top end I would definitely look at it. Get yourself a good shop manual if you are into doing the work yourself, Bentleys is a great one for BMWs of that era. If you don’t want to do the work yourself do some research on a good independent shop where you live, and they should be able to take care of it for you. I have an E34 535i that I check the valve adjustment every time I do an oil change. Granted that might be a bit overkill, but I like to make sure everything is well in spec since it has a lot of miles on it.

Another thing to keep a close eye on is the cooling system. Older plastics in that system can be troublesome if not taken care of and bleeding the system well is an important thing. Overheating can cause havoc on those long cylinder heads. Also make sure the fan clutch is working properly, and not locked up or out of balance.

On the M20 in your 325i, it does have a timing belt that needs to be changed, the book calls for 50K miles or four years on those. If you are unsure if it has been done just replace it and do the water pump while you are in there. They are really easy to do, and doing it will give you great peace of mind that it is taken care of.

Besides the obvious regular oil changes, spark plugs, and normal maintenance there isn’t a huge amount to deal with on them.

Like any old car sometimes sensors can go wonky and cause issues but those can be addressed if they are causing problems.

All in all, those are easy on the maintenance side and will provide you with lots of fun driving.

Best of luck!

Cary

Please email me any tech questions to Carysgarage@gmail.com and I will write up a piece for you.

[Image: sritakoset/Shutterstock.com]

Become a TTAC insider. Get the latest news, features, TTAC takes, and everything else that gets to the truth about cars first by subscribing to our newsletter.

#Tech #CarysGarage #BMW #ValveAdjustments

Cary Hubbard

More by Cary Hubbard

Comments

Join the conversation

2 of 7 comments

MRF 95 T-Bird on Dec 17, 2022

A similar valve adjustment was also part of the maintenance regime on the Slant-6 Mopar. For all of their robust refuse to die nature it was kind of necessary. My dad used to do them on his Darts and Valiants with a feeler gauge and when the engine was warm.

2 Reply
Scoutdude on Dec 19, 2022

How many miles are on the car and if there are any records of previous service. If you don't have any records or signs of the water pump, fan clutch, radiator, thermostat and timing and accessory drive belts having been done in the last 4 or 5 years just replace them all now. Seriously consider replacing all the radiator and heater hoses too. Make sure the fan is carefully inspected before being transfered to the new fan clutch. Any signs of cracking just replace it. Definitely won't be cheap having it done somewhere and not really all that cheap for quality parts but worth it compared to what you can spend if one of those items fail and you don't catch it in time. Don't skimp on no name parts, it is a false economy.

1 Reply

Recent Comments

Amy I owned this exact car from 16 until 19 (1990 to 1993) I miss this car immensely and am on the search to own it again, although it looks like my search may be in vane. It was affectionatly dubbed, " The Dragon Wagon," and hauled many a teenager around the city of Charlotte, NC. For me, it was dependable and trustworthy. I was able to do much of the maintenance myself until I was struck by lightning and a month later the battery exploded. My parents did have the entire electrical system redone and he was back to new. I hope to find one in the near future and make it my every day driver. I'm a dreamer.
Jeff Overall I prefer the 59 GM cars to the 58s because of less chrome but I have a new appreciation of the 58 Cadillac Eldorados after reading this series. I use to not like the 58 Eldorados but I now don't mind them. Overall I prefer the 55-57s GMs over most of the 58-60s GMs. For the most part I like the 61 GMs. Chryslers I like the 57 and 58s. Fords I liked the 55 thru 57s but the 58s and 59s not as much with the exception of Mercury which I for the most part like all those. As the 60s progressed the tail fins started to go away and the amount of chrome was reduced. More understated.
Theflyersfan Nissan could have the best auto lineup of any carmaker (they don't), but until they improve one major issue, the best cars out there won't matter. That is the dealership experience. Year after year in multiple customer service surveys from groups like JD Power and CR, Nissan frequency scrapes the bottom. Personally, I really like the never seen new Z, but after having several truly awful Nissan dealer experiences, my shadow will never darken a Nissan showroom. I'm painting with broad strokes here, but maybe it is so ingrained in their culture to try to take advantage of people who might not be savvy enough in the buying experience that they by default treat everyone like idiots and saps. All of this has to be frustrating to Nissan HQ as they are improving their lineup but their dealers drag them down.
SPPPP I am actually a pretty big Alfa fan ... and that is why I hate this car.
SCE to AUX They're spending billions on this venture, so I hope so.Investing during a lull in the EV market seems like a smart move - "buy low, sell high" and all that.Key for Honda will be achieving high efficiency in its EVs, something not everybody can do.